I'd keep it fairly simple, as the room is small and it is already "full" to the eye.

 art can be like size of the table one piece and you can pick from kitchen colors or your living room

If i did a gallery wall, what size ahould i do for the whole wall (how many frames, how big should each frame be)? i like the wide mat and a smaller pic.

I think the consensus is do not put a gallery wall.

I did framed canvas art from Greatbigcanvas.com

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I love Sonja Suitors idea of putting only trim on that wall. It’s a small space, so pictures will often be askew from people brushing against them. Whatever you decide to do, paint out the wall register the same as the wall color.

Love the board and batten accent wall idea!