Your room needs some anchoring, the pictures need bigger frames, the curtains are too heavy for the space.

Bolder frames

I disagree - your navy makes a very strong accent. If the colours are accurate in this photo, I suggest removing your pink bits - I'm seeing yellow and peach undertones in your walls and floor.

The rug is a bit shouty - I'd rather see the artwork making that strong a statement, so the eye travels to that wall as a focal point. A much larger coffee table would do well here, as would a side table or two, task lighting, letting the drapery stack against the wall rather than the window, and painting out the fireplace.

what kind of artwork/size do you recommend as the vent is in a very awkward place

something like this maybe? But placed horizontally above tv? Or do you feel a vertical piece is best?

Your overhead lighting prevents anything from looking right. You need lamps ....NO overhead lighting. Your things are lovely.

Someone mentioned putting something else on fireplace ledge down below. Would a storage basket work? Any other ideas? I can't have anything breakable

Reframe the prints.

I would have chosen a rug with some red in it I find the whole room a bit safe IMO spaces need some risk to be interesting.Lighting is needed for sure at a level where you need light. An arc lamp going over a large coffee table would have been my choice so that everyone in the space has a place for a drink. I am not sure how the navy came into the space but to me it really has no place , maybe a touch of black would have been better some interesting pillows and my choice for drapes would have been nice full natural linen drapes with maybe a band of red about 1 “ from the floor

I see a lot of suggestions for a lamp or additional lighting. Is a lamp really necessary if it will never be used? Is it just for aesthetics? There are 6 built in lights in ceiling that can be dimmed and adjusted to different brightness

I agree with others who suggested lamps. They would warm up your space and add visual and emotional interest. If it will never be used, then it's a waste.

Would you be open to this idea - use timers with your lamps! Set them to go on during a time of day when your room gets less light and go off either when more light is hitting your room or you turn in for the night. Then it's even easier than flipping the switch to your other lights, which you can do if you need more lighting, but otherwise the work is done for you, the room is lit, and the mood is set.

The pedestrian fireplace is much too dominant. I would cover it with wood, framing the firebox with marble, granite, or slate. The pictures need reframing - preferably involving either darker frames or richer matting. That would help them stand up to the strength of the drapes. I am not a cushion lover, but the upholstered pieces need something to relieve their lumpiness. As this is not a furniture showroom, get rid of the overhead lighting. A mix of table and floor lamps would allow varied lighting and more comfortable reading. Picture lights would bring out art details and create a comfortable mood.

Nothing above the TV. You could put a small square piece of art behind the chair, if you like. Just enough to balance the TV wall; you don't need to fill it.

You just need much bolder pillows and candles to match. Try a deep rusty red, or even a turquoise.

It might be useful to share a design of ours here.

i like your advice groveraxle of putting something on the wall behind the chair as opposed to trying to fill the whole wall. do you think floating shelves above the chair would work instead of art?

I'd like to see the whole TV wall, sweeps, before I recommend, but my sense from the little I see is that floating shelves will be too much. Can you give us a shot of the whole wall, end to end, taken as straight on as you can get it?

The mirror is not optimal fit the mantle... Perhaps something 'organic' instead as well as some repetition of the red from your kitchen.

Drapes need to be hung on wider rods to allow all of doors to show. (Are they black or navy? If navy I would re-purpose them in another room and consider replacing with heavy quality white draperies. If needed for room darkening for watching tv get white with room darkening lining.

Everything is a little monochromatic for me. I neither like or dislike the carpet..

Would continue the use of red for accent pieces, pillows etc. Decorating mantra.... 'Repeat, repeat, repeat'.

You're close, keep tweaking it!

Agree with above posters, the room needs some visual interest. The ideas above are great. Changing the fireplace would anchor the room better.

The purpose of lamps is to make a room warm and inviting while providing task and accent lighting. Overhead lights, called ambient lighting, are for switching on so you can see how to get into the room in the dark. They are also helpful when cleaning and looking for dust bunnies. During normal use, once in the room, you turn off or mostly dim the ambient light, and turn on the lamps and accent fixtures to add personality, draw focus, and be useful for reading, working a crossword, knitting, playing cards, etc.

Move the four art pieces to flank the slider, adding red frames to them. Paint the FP white and use trim to beef up the mantel. Paint the FP wall red, pulling the kitchen accents over to the room..

here is the wall groveraxle

It would be helpful to have more of the bottom of the wall than the top, but here is my prescription. I wouldn't put anything over the TV because that will just draw your eye up and to the vent. You want to keep the focus down on the wall. I added a taller plant and one piece of art, then adjusted all the pieces--chair, TV, art, and plant--left and right a bit until I thought the wall balanced. (You really need to see the bottom of the wall to do this.)

For now, just try pulling the chair out a bit from the corner so it overlaps the TV cabinet a bit. That and a small framed piece on the wall behind is probably all you need.

Focus your decorating below the window and door frames where you live. Do that right, and the upper space will go un-noticed.

I went ahead and added the floating shelves bc I wanted to incorporate some photos into the room. I obviously am not done putting things on there. I also added a different shade of red pillow and some accents to see if it works with space. What do you think?

Those two photos on the fireplace wall near the chair, I would repeat two of same size on the wall near chair. Remove shelves.