With a nice clean space like that you can go a lot of different ways. I would start by looking at shower curtains, because they can become the focal point. When you find one or two (or more) that you like, you can play off of the colors in the curtain to find the color towels, bath mat, and even wall color. Some ideas: You could go classic black and white, with a touch of something bright if you want for an accent (like the fuscia in the photo) Or something "spa-like," in acqua and cream. Or you could go bright, with teal and lime green. Another classic look: tan walls, white and/or tan towels and bathmat, simple white accessories. Good luck!

Reconsider not having a bathtub in your large master bath space, which currently has a good bit of wasted space, for your convenience as well as for future buyers. You also don't appear to have any counterspace or storage by the sinks, the shower is big enough that you don't need a door on it, and a small freestanding soaker tub could fit under the window in the wet area of the space if the door to the bathroom was moved a couple of feet up the wall opposite the sinks. You can't put furniture on that wall, anyway, due to the traffic pattern.

I would look at this room from 2 angles, in this order: convenience (as you have young kids and need everyone to be able to fully use it) and aesthetics. Equipment and accessories: #1 - first look at what is necessary to have in this bathroom: a place where to keep soap, toothbrushes, toothpaste -- all within easy reach for all users (including not-tall-enough kids) #2 - a cosmetic mirror ? #3 - a towel rail #4 - a small cabinet for storage Ideally, #1 should be stored directly on the sink, as it's lower, within easy reach for the kids (see below photo from one of our baths): You can do this also witha smaller sink, like the one we use in the half-bath: If you'd like to keep the one you have (which is really nice), you'll have then to use a shelf (as also suggested by someone else above), and I'd propose one of white porcelain and not one of glass, as it's a lot less reliable with children around. Below, an example of what I mean. The shelf should be installed as low as possible to be reachable by the kids, but also the mirror should be much lower, so that they can use it (much more interesting for them) without having it too low so the adults can't see themselves anymore. For #2 look on the left of the mirror in this photo (if you need it): A towel rail (#3) is absolutely necessary and make sure it's one where you can stretch the towel for faster drying (like the one in the 2nd photo). The cabinet storage (#4) could be placed on the wall from the right of the mirror, as you can see we have in our half-bath (also 2nd photo): Aesthetics: I agree that blinds on the window make no sense, light should be let to flow in as it's much needed in a bathroom. If you don't have time or disposition to paint the walls (and maybe they should remain white anyway, or a light color, because this is a small space), you might use decorations from your DYI center and stick them on the walls (see an example below from my daughter's bedroom, but there are other smaller ones for any kind of space): This way, the room becomes more attractive, more welcoming and more colorful (with very low cost). I hope this helps :-)

A very simple layout keeping the floor space within the kitchen, the WIP takes up a lot of space with not much gain, The broom cupboard could be moved to the Laundry/entrance, narrow. If the wall has been bumped out to the eaves on the deck side giving an extra 300 depth to the kitchen you could make the island 2700 x 1200 and all drawers. The wall of narrow pantry will hold all pantry needs and more, no deep cupboards to dig into. cheers