Daytime pics

It looks really nice. Are you really looking for ideas to make it comfy? If so, that is determined by the quality of the upholstery and we would have no idea of that without sitting on it. As far as finishing with accessories, the room is screaming for plants, either on the tabletops or a corner floor plant. A terrarium on the coffee table would add a lot too.

I mean “comfy” as feeling warm and cozy more of that as an aura. I like the plant idea.

I would rather be looking outside if I were sitting there. Do you have any outlets for lamps, they always cozy a space up. The outdoor wall lighting and ceiling light I see reflected in the night time pix is not giving that feeling. They're washing it all out. Fiber shades that look like faux Roman shades could help. You don't have to lower them unless sun fade of your furniture starts to happen. Are you considering a paint color? Green or yellow are great in sunrooms. Plants are a must1 Just search under the box above for "sunroom" to get inspiration. Here are some...

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I would not do dark furniture in a sun room , you need window covering or no matter what you put in there will fade quickly. Maybe show the whole space and let the animal out of the crate please. That furniture looks very straight backed which never says comfy to me , too may pillows that need moving before sitting. If that is the whole space I would do 2 nice armchairs with an ottoman to share . As for plants yes they would be nice but first do some solar shades to keep the heat and the UV out.

I find that black to be too off-putting for me for a sunroom--if I were fortunate enough to have an indoor sunroom (you are so LUCKY!), I would use natural wood with linens in sage green and other natural colors. If I could, I'd have a lovely citrus tree in there, too.

Someday....

@p - Wondering if you will be returning to your other thread about your desk, as people have continued to try to help you there?

https://www.houzz.com/discussions/5840052/need-help-decorating-my-kitchen-desk-for-under-150

The furniture is outdoor furniture from
Crate and barrel. It’s spent three whole summers in the sun and hasn’t faded a bit! The cushions are sunbrella. It’s a dark brown faux wicker not black. We weren’t utilizing it outdoors enough because it gets very buggy here with the woods in westchester New York so we hosed it off very well last summer and moved it indoors so that’s how it ended up in this room so we are not switching the furniture. Not an option thank you for all the great ideas!!!

Can you centre the sofa on the window and move the side table over so it is between your sofa and chair?
I think it is important for the sofa to be centred on window. If the side table doesn’t end up fitting well, then forgo that one piece of your set for something else that coordinates. A small round side table would look nice.
Add some more accessories, a throw blanket, and some plants.

You need a lamp and simple window shades for nighttime use. Add a plant or two to connect it to the outdoors.

Also, now that your set is indoors...you can use all different throw pillows and not just outdoor ones that tend to be stiff. Add some toss cushions with some pattern and texture with softer inserts. Try to find some patterned ones with hints of your floor colour and wall colour to pull it all together.
Also like the ideas for some blinds to soften the windows, even if you never close them.
You are lucky to have such a great space! I would adore a sunroom space to enjoy all the light and outdoor views.

Colors make a huge difference to how you feel in your sunroom, along with design. Check out this blog on Enclosed patio ideas & designs on my site!