use a shade of the shower curtain. keeping it light will unify and enlarge the space. Winter in Paris by Valspar is a very pale aqua that changes from green to blue with a hint of grey. It works with our warm almond tile shower and cooler grey tile chosen by former owner.
I found it easier to choose a different hue than try to match beiges. so a pale but cool color would be a nice subtle contrast. Save the brown from the walls for accents. Teal or coral accents could work. But keep walls light. Get white or ivory sheers for the window.

warm white for vanity?

Prime it with two coats of white primer. Remove the shower curtain and pick a new one. Then finalize your choice of colors. Blue and green go well with almond.

I like Kathleen MK's idea. You need to establish a design, even just for color. It could help to tie a bath mat as well.

I like the vanity paint to work well with the tile.

Thank you all! I have a warm white vanity. I love your input and I appreciate it!