Am I understanding this correctly?

You need to look at samples on the plane in which they are intended to be used. They are all flat here and you won't get an accurate idea. Counter 1 looks grey. Splash C, D, E look dated.

What style is your bathroom going to be? Do you have inspo pics?

For bathrooms, most use four inches of the counter. Are you planning to tilw rgw entire wall?

Do you havevan inspiration picture?

Counter 2 Splash B

I’d say mid century modern style. I was leaning toward counter 2 and splash B!!

I don't think MCM when I see counter 2. I also don't really think backsplash when I think bathroom. How much of your wall will be covered with a backsplash? Again, inspo pics would be great.

We may skip the backsplash in favour of using four inches of the counter material to go up under the mirror. Some inspo pictures here. Just hints of Mcm, more transitional

I need to see the floor the shower walls and IMO the same material for those then a nice counter with matching backsplash all kep simple in a small space . I use 12 x24 porcelain tile for bathroom floor and shower walls then I can choose an interesting counter and backsplash . Those easily changed down the road not so much the floor and shower

Forget all the attempts to do "more". More is less. Less is more. The whole flat lay is horribly busy. Stick with simple. No more than 3 tiles, and none of them behind the vanity, unless you are only using 1 tile for everything else. Do the standard 4" splash for that, the shower curb, niche bottom, any pony wall top, etc. Create continuity, not clash.

Best to post the layout and elevation of your vanity wall. What is the plan for the shower materials which should be decided along with the vanity wall…shower floor, shower curb, shower walls and edging materials….product storage design (niche or no, etc)….