There is a color called masada from benjamin moore. it looks like leather on the walls. It would be interesting to do the walls in masada, basically enveloping the vanity top, which is actually not bad at all.. I hate the placement of the towel ring. I would put that one in the curved wall, even if you saw a loop in a towel and hang it from a hook. could also use a roll a paper towels, which I find everyone tends to prefer in a guest bathroom. Could you take a picture of the light fixture, another of the cabinet and another of the floor please
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This is the only picture I have. We haven't moved in yet. I will see what if can do.

No worries. do when you can and happy moving

Call a professional.

I like the towel bar idea. I can mask the curve of the wall and make the space seem more normal, if that is what you want. Mirrors or medicine cabinets can also do that same thing to the curved wall. Patterned wall paper or somethig should be avoided as the pattern, together with the curve, will mess with your mind.

The light fixture is a bit ornate (for my tastes). It is a hanging pendant light, with a vine-like metal decal on the part hanging from the ceiling. It is centred above the sink. Floor is laminate, I believe.

Should I centre the sink against the flat part of the wall? Right now it is off centre, but it looks like they moved it closer to the middle of the entire wall (flat and curved part).

What if you replaced the mirror with a larger frameless, beveled one? It would take up more of the wall. Then I really like the idea of a plant, basket, or something ornate on the curve. I think I'd look for a much larger picture to replace the one you have and just lower the towel bar.