Help me with artwork for my living room

Looking for help with what sized artwork and where I should hang it for my living room. The room is angled funny from the rest of my house so everything looks off center despite the TV being in the direct center of the room. The living room opens to the kitchen.

A photo of the space and the art hanging on the wall above the chair for context.

Open to any other feedback for the space—I plan to get new side tables and replace the brown couch once I find something I like better on FBM or at an estate sale. And if anyone has feedback on which color couch pillows to buy, I’d appreciate it! I’m struggling on knowing what other colors to bring in aside from blue.

(Please excuse our baby play pen!)