You don't have to know what will go on the upper part of the wall. Prep and prime it and you'll be ready when you decide. I think you can use that medicine cabinet if it is something you love. I'm not sure how to judge your "is it too much" thinking though -- do you really love it? As far as size, make sure you have the height for it with lighting that you like. Include the height of your vanity, the splash, some room above that, the mirror and then see what you have left for lighting and clearance above and below. I would like the wider mirror, but if your ceilings are low, you may need to go shorter. If the mirror fits, what would you think about getting some rub n silver from the craft store and adding some silver highlights to the mirror and lightening it up a bit? If you like that idea, go to Hobby Lobby or Michael's and get some of that rub on silver (yep -- use your finger even), and give it some highlights. That might soften it a bit and tie it in to your lighter room. If you've never done anything like that, find something to practice on -- a picture frame, a flower pot or vase - something that you can play with and see how it works on edges and details. For lighting. look at the fourth row of that Ferguson's lighting link, look at the Feiss Claridge. That could follow the shape of the top of the mirror and it might be nice to bring in another curve rather than a straight line. Personally, I like a three light fixture most of the time. It's that odd number thing, plus, if that is the main source or only source of light in the bathroom, I think it's better to have the ability to have more light and tone it down with a dimmer or smaller bulbs if you need to or want to. As far as the toile, it's hard to say not seeing the space and what you have. It might look great, but you keep your other elements in mind. Glad you kept the grout light. I do think that the floral idea will work better than some other toile patterns because of the round and flowing lines. The ones that are tiny sketches scattered could wind up looking like one more liner element. All I can tell you about the creaminess is that I can't tell you anything from my monitor. You'll have to look at the different elements together. You should be able to order a sample of the wallpaper and you might want to try a few to compare.

My thought is that the second one does not allow much wall space in the bedroom for furniture or a tv if you want one. Will the walk in closet accommodate your dressers and chests, or take the place of those pieces? I do see what you mean about no place to hang towels near the sinks, which is problematic. As far as a tub goes, it's up to you whether you want one or not. Is there another tub in the house? Kids need tubs. The more I look at the choices, the more I like #2 for practicality, as long as you consider your need for furniture in the bedroom.

hard to say without seeing picture of the bathroom, and knowing more about your style/preferences. What color/stain will be vanities? What height are ceilings? Dark space or light space? knowing only one variable-Crema Marfil (which I happen to love)-I'd go and say that very warm white, creamy, maybe even somewhat pink-ish white might work well..in my previous bathroom I used Everlasting by BM. Very flattering to complexion. But our bathroom was very light, lots of sun. One should try sampes in their own space with all the other elements, to get good impression of how color X will work.

If you're looking to paint match any of your whites, try the Color matching apps from BM or SW. As for BM whites that aren't too warm or cool, look at Cloud White or Oxford White. They also have a pretty pure white called simply "White" (OC-151). Whatever colour you're considering: buy the test can or those Samplize decals.