Post some photos of what is across from this as well. Did you try the cabinet on the larger blank wall? If it fits I would center it there and then place two pieces of art vertically on the wall next to the doorway.

All you need on the back wall is a large canvas you like.

However I find your pendant is much to high, I prefer a chandelier with shades so that you don't get the glare from the bulbs and should hang a about 36 inches above the table top. I also suggest you find light colour chairs pads for your wood chairs.

Some option

or

or you can switch wall art with arched cabinet

You can place the cabinet in the corner and then add artwork on each wall.

At first I didn't think the cabinet and dining set went together well but I do like Celery's visual image.

I think the cabinet should go the blank wall but it really is at odds with the chairs for sure .I think the cabinet is not in proprtion to the tiny table .