I would do at least a 6" backsplash.

Would also recommend using at least a 6" tall backsplash. How will the wall above the backsplash be treated? Will it be painted gyp. board or tile?

I'd consider a taller backsplash ... 10-12" ... and I'd go with wall-mounted faucets. They're not typical, but they make cleaning easier, as you don't have to "floss them" while cleaning ... instead, your cleaning cloth skims right under the whole thing. This photo example seems rather low-mounted, but you get the idea.

Other concerns:

- I see a drawer for "hot tools", but the only electrical outlet is on the other side of the seating area. I'd want an outlet in each area.

- Don't allow that pencil drawer to be too shallow ... my daughters' bathroom growing up had a too-shallow drawer, and things were always getting "hung up" /keeping the drawer from opening. Insist upon at least 6" depth.

- The whole thing is very busy ... fussy even. Multiple sinks, multiple mirrors, multiple lights.

How tall is your ceiling. I think it might help for sconce placement to make the mirrors more narrow and not as tall.

There is going to be splash. Take your pick, do you want to clean it off the backsplash, wall, and mirror? Carry the backsplash up to the bottom of the mirror.

I have almost the exact same setup in my master bath--except that instead of a vanity with the kneehole we have shelves for towels. We ran the backsplash up to the bottom of the mirrored medicine cabinets, as Mark suggested.

And I don't think it's too busy (neither did the 50k+ Houzzers who added it to their ideabooks).

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