What about a couple of natural wood sheves instead of artwork since you have the pretty wallpaper

I'd hang a family picture, something fun from your past.

When I saw the first picture, I had the same reaction as Kendrah.

Yes! The bathroom looks unfinished without the other walls
Not having that pretty wallpaper on them.

Seems there should be some reference to the cabinet color with the frame or the artwork.

A case of not nearly enough and a bit too much, in different places: )

Paper ALL THE WALLS , and I would definitely want to change counter top to a plain white, as it seems extremely busy with the paper, jmho. and doesn't seem in keeping with the very fresh and airy feeling of the paper. Scale not great as well.

Nothing please between the two mirrors! Or note for us the vanity size and ONE large,

framed mirror!

Watch out for busy effect on art......needs a dark background

Consider a couple shelves so that the wallpaper shows through. This idea from Walmart website, you could paint the shelves same color as cabinets.

FTCBJJA 3-Tier Rustic Wood & Metal Bathroom Wall Shelves – Wall Mounted Storage Rack for Toiletries, Towels, and Toilet Paper – Industrial Farmhouse Bathroom Organizer(Brown) - Walmart.com

I like that not all the walls are papered. It give the eye somewhere to rest since the paper is fairly busy pattern. I'd still suggest the natural wood shelves as it gives a different texture to the space and I like the warmth of the wood.

For me, I probably would've papered the walls on the sides of the toilet, and painted the back wall a color, or left the back wall papered and painted the side walls a color, but regardless, the toilet looks so happy with his little toilet paper eyes. Excited about the new ideas maybe.

Remove the strip of wall paper behind the toilet. Color drench the walls which are not papered, the wood work and the ceiling the color of the door.

You also could add some trim to the walls. Amazon has press-on or glue on pieces.

Would you consider wallpapering the other walls? It is such a pretty paper, but I think it loses some of its impact.

I love your wallpaper too. Ive been looking for a botanical paper for a powder room. Would you mind sharing the name of the paper and where I might find it?
Looks like you are getting great advice here, good luck!

The wallpaper is stunning! Maybe try a minimal line drawing or a small abstract piece that complements the tones in the wallpaper without competing with it. A simple frame or floating canvas could tie it all together beautifully.

The paper is lovely, and I like how you have arranged it in the spaces. It is well-done, suits the areas, and is artistic. Anybody can wallpaper a whole bathroom without giving it any thought; but your choices are well- thought out. The paper looks stunning with the granite, as well as with your cabinets. And in the other area, the paper would definitely make a great backdrop for any art that you would like to hang, or for shelves, etc. Personally I would not want that paper on all the walls; imo, would be Too. Much. (even though I like the paper I would not need to drown in it. :)

Art is very personal, and you could really hang just about any art over that paper. It has pattern, but it’s really a pretty neutral backdrop. I think black and white photographic type art could be one nice option.

But there are really so many ways that you can go with art and that paper. And I actually also LOVE the idea that Celery posted in the comment directly above. That sign is perfect. Brilliant.

I really like the cabinet color and the wall paper. I agree that a white countertop would look great.

Perhaps the toilet alcove would look better painted in a deep color with large art over the toilet.

I agree with Kendrah. Would suggest the wallpaper be extended to other walls.