Try shades from the floor tiles. More of a mid-tone (not the lightest or darkest). Dark would be interesting if it weren't for the many light elements, which look too contrasting, which isn't a plus in your situation.

A bathroom/powder room is a space that doesn’t need to be coordinated with an adjacent room, unless you want it to. You could go a shade lighter or darker than Revere Pewter, or if you want it to have its own personality, choose a complementary shade that works with the RP + the flooring and decide if you prefer a lighter or darker effect.

That's not a powder room, it's a bathroom.

"Lead to revier pewter setting room with brown leather firniture"

What?

You want to go pale so toilet and shower don't contrast so much. Match the floor tiles but in a much lighter shade of of paint. Consider beadboard as below or white beadboard and light tan above to echo the floors. Get a nice tallish narrow antique wood cabinet/shelving where you have the white shelving. If shelves are open, add classy rattan baskets, foldeed towels, and everything else in baskets.

Take down the cabinet over the toilet and put a piece of art there so it's the first thing you see when you walk in.. Coordinate towels with art.

SW Stone Lion

either Brass or Satin Nickel hardware would be great.

Some optios

or

A sink and toilet only comprises a powder room. When you add a shower it is no longer considered a powder room.

I like the color of this bathroom, but can understand why you want to change it.

Here's the bathroom in BM's Revere Pewter.

Can be accessorized with any colour to the OP's taste!

What look are you wanting. Revere pewter is a very flexible neutral that works well with most colors. It is a beautiful backdrop for a fall color palette, which can include deep reds like your bathroom.

That doesn't mean you have to love the deep red bathroom next to your living room, but without knowing what colors you do love it is hard to tell you what colors you should use in your bathroom.

A lighter shade would be less jarring. Aside note - that shower is the size of our hotel in Rome! Don’t drop the soap 😳. Glad you can make it work.

I think Revere Pewter would be an improvement over what is there now, but the rendering of it that lisedv posted looks boring. The green that Celery posted looks more interesting. SW Sea Salt is a popular blue-green used in bathrooms. Look at BM Quiet Moments (1563) if you prefer that brand. Or look at Healing Aloe, which is a lighter version of QM. I like to use blues and greens in bathrooms, but I usually end up cutting the tint in half to reduce the contrast with white fixtures. If you really prefer Revere Pewter, you can always liven up the room with towels and decor.