That looks like a room I would have. I'd go with hershey bar chocolate brown and werther's butterscotch gold and maybe some off white. Maybe stripe or figured towels? I didn't see a shower. Maybe a mirror on that long wall? There are lots of oval stenciled ones around. I know. I've been looking at mirrors. I like yours a lot. Tell me about it. Maybe another one with a similar frame hung the long way? It looks like your medicine cabinet is about half way of the long wall? Then build your art work around the mirror? It might add some depth, too. I drag home 3 or 4 times as many things as I think I will use, hold them up and return the ones that don't cut it. I'll be doing that real soon. I want to have my paper up first. Yup. Papering. There's something about paper that speaks to me.

Unless you want to go pastels, I would keep the yellow shower curtain. I would remove the towel bar on the lone wall. I would put the towel rack on that wall, a little lower than you have it now. In place of the towel rack over the toilet I would put two framed prints, the frames picking up the color of the wood tones of your sink cabinet. The prints could be florals, landscapes, even modern art but should have the yellow and pink tones you want. They should measure about 20x20 each and place one over the other. The sink in on the far right therefore anyone washing her hands should be able to dry them there - place a hand towel holder on the wall next to the sink to the right of the mirror. Place a tall plant ficus/palm, or so, on the left side of the sink to break the mirror from the pictures. The planter can be in yellow of your shower curtain, or pink or combo. Hope you like my suggestios.

My opinion will be biased because I have very similar tile in my master we redid 12 years ago. 4" squares on the diagonal for the shower floor and 12" squares on main floor and up the shower walls. Coincidentally we are in process of redoing my kids' bath the past few weeks (it was also redone 12 years ago) because a hard-to-find leak in the tub prompted us to consider replacing it....which then brought about the issue of replacing the tiled tub-surround that would be damaged...and we would also have to try to retile some spots on the floor because a new tub would be a smaller footprint leaving some bare spots once old tub was pulled out. My point is that we also had to figure out the whole, "do we do an updated 'patch job' to save a lot of money, or do we just gut it and accept the cost as the price of being at peace with it/enjoying a new look and improved function. Right or wrong...which is always a very subjective thing....we gutted it and I'm thrilled. I was not interested in painting my cabinets just to have them have peel-issues due to steam, and we also got rid of the tub altogether and opted for a stand-up/walk-in shower for my older kids. Resale was considered on this issue...but by the time we move, someone can either love it as we've made it, or we will price the house with an "allowance" in mind. The old space had hot-chocolate colored walls and 'slate' porcelain floor and tub surround...an overall warm and cozy feel but also tired and dated. The new space is a porcelain 'marble' hex with white subway walk-in shower that is awaiting glass doors...an overall calming feeling that is also bright and fresh. I now actually wish SO BADLY that I was able to redo/retile MY whole bathroom (tile similar to yours). And there's nothing wrong with my bathroom, and a planned paint job on the walls will help me like it even more...... In my kids' bathroom, however, even unfinished with the floor and shower tile installed just waiting for the rest to come together (waiting on backordered tile base moulding) ......... I walk in and just smile and breathe deeply because of the way the space now makes me feel :) So my very biased vote is to gut it ;) ;)

@Jean thank you for the info, which I appreciate. I'm in Canada and only 1 of the stores that sell them is anywhere near me, I phoned them and they only sell to stores. plus, if @Diana Bier is correct about prices, I'm looking for something more affordable, but they are definitely gorgeous! Thank you all for your input, which I appreciate very much. I ended up going for a light aqua (sherwin williams Watery at 40%). I know in the pictures it looks more blueish but it has some green in it too. I'm very happy with it (very spa vibes!) but am wondering what do for my built in niche near the toilet : 1) do I keep the inside part wood (that I would stain) or paint it white and 2) what would you do as a background : wallpaper? See pictures below please Thanks in advance :)