I think that the walls need a little deeper color. To my eyes, there are too many different colors in your furnishings...white, black, several shades of brown, etc,. The white things seem very stark. I would add lamps, too.

What a lovely room. I like it a lot as it is...with a couple of additions. : ) Here's some ideas... I agree the rug is a tad small, but I like it a lot. You could put a sisal underneath and layer the rugs to enlarge it. Lamps would help you feel "homey" in the space. Perhaps a floor lamp right of the console and a table lamp between the two chairs. A fern on the corner window/plant stand by would add some greenery/life to the room too. An easy project would find some fabric you love and reupholster the piano bench. Scissors, screw driver and a staple gun (and fun fabric) is all you need. Here is a sample of a layered rug...

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I like this floor lamp for you...I like the contemporary silver finish that speaks to the legs of your coffee table. Or, natural wood legs would look good too. I also like this aqua glass lamp for the round table. The crystal base likes your crystal accessories. :)

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Dimond Lighting D2727-LED Aqua Swirl 1-Light Table Lamp · More Info

Is the white chair comfortable for talking, reading, television watching? If not, you could look into replacing it. Also, you might enjoy fooling around with texture. Somehow your room reads as a bit hard to me. (I like your pooch, too.) You didn't mention budget, but if you can afford it, a new, bold-colored rug could suggest the colors for the textured pops - pillows, a throw, lamps. Do you need some lamps?

Not knowing your budget, for a inexpensive fix, change out your small accessories on the coffee table, they are getting lost there and add no color. Add some larger accessories in their place, larger books, stack of boxes, etc. On your media cabinet add a couple of tall vases with some color to replace the one candlestick and something low (tray, ceramic platter) under the TV . Invest in some colorful pillows. A green plant (fern) for the plant stand would look wonderful, as would a floor lamp left of piano.

Have you considered a darker color for the credenza -- maybe something closer to the sofa color? The white cushion on the bench is beautiful. White for the credenza -- not so much.

Your walls look to be two different colors. A medium tan (without pink or yellow hue) or light brown on all of them would look good on your walls. The frame of the round picture if either a lighter or darker shade of the same color you paint your walls would be suitable as well.

Do you have as much blank wall space to the left of your credenza and tv as you do to the right?

Do you have any knick knacks or collectibles that might be displayed in a wall hung cabinet with shallow shelves such as candy dishes or vases or candle holders not currently being used for their intended purpose, preferably with glass doors so you don't need to dust them regularly.

I like your current rug. It suits your furnishings quite well. Unlike some, I like the look of wood floors well enough that I don't think you need to try to cover wood floors with a huge expensive rug. One thing you might look for is one of the products for sticking a rug to the floor. I note your rug has a potential stumble curl along the side.

I agree ... cute dog.