Wallpaper the entire room and you will solve the problem! Take your inspiration from the beautiful rug.

I would have those switches moved to one side or the other. Their placement makes no sense.

I would do art, but art is very subjective, so it is hard for anyone to suggest anything. Most art suggestions will also be generic online options, which is not what I usually want for my art!

I feel like bathrooms are a place you can have fun with decorating, since they are independent from the rest of the house.

You have room for some nice large art pieces, whatever strikes your fancy. Two of our bathrooms are filled with photos of nature, most of them we took ourselves (or were taken by friends). Our third bedroom is a Bison motif - the mascot of our favorite college football team.

Wallpaper is a good idea if you can find the right print. You could also add art to the room. I’m not seeing any towel hooks/bars so I’d add in a place to hang your towels then add art above them. This way the light switch can be in between the two. This pic shows the towel hooks offset but I’d probably hang them in a line.

The art shown here is just generic- it’s really just to show placement. If you go with art search out some pieces that you love and will enjoy looking at every day.

Maybe turn the arched storage unit to face the entry and add a bench under the window? (I would probably move the storage unit left a little from this illustration, but AI wouldn't!)

Another art placement option over the toilet:

These are botanicals, since AI used one in the first illustration, but I might actually look for something that uses the jewel tones of the rug.