I'm not clear if you've replaced the vanities, which do need replacing if you're going to the expense of new granite, sink, and faucet. I don't see why you'd want to make those permanent, expensive changes based around a design scheme of outdated peach wallpaper.

I just finished a remodel and wallpapered behind my bed as well as in my bathrooms. I am absolutely delighted with the end result. I am not worried about wallpaper removal as I have no plans to remove it nor do I have plans to sell. All of my choices were driven by my personal aesthetics as well as my personal functionality - I am not worried about a mythical buyer in the foggy future. As to removal, I didn't put up the wallpaper nor would I be taking it down LOL. If for whatever reason I wanted to get rid of it, it would be done by someone I hired. FWIW, I remember my parents removing wallpaper as a child and it didn't seem that difficult. They used some kind of steamer so it was tedious but not highly skilled.

I only buy art that I love or that illicits a strong reaction in me, and I always frame it in a way that makes the art look its best, with no thought of which room it might go in. But when hanging pieces in my home there are probably some reasons I put this piece in this room...a similar color to something already there, another piece hanging that this one looks good near or because it’s the exact opposite of everything else. A little tension can really ignite a room. With all that said, something modern, abstract in a very simple frame would be a nice balance to the traditional paper. You could even tease it a little with a bamboo frame.

It is difficult and expensive to have wallpaper installed where there are high ceilings. While I think what you're looking at could be stunning, bear in mind that at some point it will need to come down. Either you will get tired of it or it will make your house difficult to sell. I'm not sure it was a coincidence that right after we removed the wallpaper in the foyer of our previous house while it was on the market we got two offers. This was after it was on the market six weeks.