Agree with Patricia. A gallery will overwhelm this space. Save your special picture to place where you will see it more and appreciate it, and find something fun for that wall, that is large scale. Not sure what your taste is, it's hard to tell with this photo. We can give suggestions if you give us a sense of your style preferences...modern, farmhouse, traditional, etc. I'd be more likely to center the couch to the wall, add some pretty drapes, and place the TV on a bureau with drawers, so guests can have a spot to put personal belongings away. Then you can add some very small end tables so they'll have a spot to rest a drink, or charge their phone, bedside. This is my guest room, with pullout queen bed. also VERY small, and doubles as a home office, so I've creatively used a file cabinet as one end table, and a small stool is re-purposed as an end table on the other side. I have a small, wall mounted television in the upper right corner of the room, just out of frame. If you give us a sense of your style, we can recommend specific pieces, etc. Right now you have a bright and pretty blank slate and neutral couch to work with!

Find a lighter color on the paint strip and continue painting with it all the way up and ceiling. If the media stand can be painted do it is wall color but a gloss finish. Add window treatments; throw pillows; ottoman with a large tray; Pottery Barn…used these in a client’s den. If I remember correctly the blue/green of the walls is in the print, but it leans more to your sectional. Walmart Forget about throw pillows…they always will wind up on the floor.

What does the 4th wall in your room look like? Is it possible to rearrange things? Give it a quarter turn so that it is no longer in front of the windows. In other words, one section on the back wall and the other section would be where the TV / console currently set. The TV could then be on that (unseen) 4th wall. I also think the TV is mounted too high.

just a few ideas that I'd suggest. a plant in the corner where that little bench is. I posted two diff types, either would work. I gave you a side table w/a lamp on the other end. I like the idea of a pouf in this camel color to warm things up a bit, or do a stool or two placed in front of fireplace. I also like these shelves between the two windows. ( I don't know what furry dog is going to do with these,,,maybe have the toddler stand on his back?? lol. hang them well out of reach and they'll be fine. I'd put a few small plants on them. This will eat up that middle space) You could also take these teak decking tiles and attach a plant/pot onto it, and hang two of these between the transom windows. if you want a bench, do something like this in the wood. all of those neutral gray tones make everything seem very cool. add some wood and some texture to warm it up a bit. over the back of sofa do a cool piece of art don't hang them too high. (your tv is hung too high btw. ) and a rug for the sofa area A jute one would work too for the dining area, you could also do this jute rug like shown. for the wall, I'd do another piece of sizable art to hang on that one wall. This one has a larger wall, but look at the black and white picture. basically the same size of yours. you want something this big. Or, do a shallow buffet or console w/a mirror over it and some greenery, like shown here.