Can you post more pics of the whole bathroom? It will help in figuring out color. Is your tub area just a tub and your shower is separate? If so, what colors are in your shower?

I'd consider painting your vanity the same color as your walls. You already know it works with your stone top and floor colors. And the floor and countertop have a lot of movement and business already. I don't think you need another accent color on the vanity competing with them.

Select the charcoal gray from the flooring and the granite.

Match the lightest beige in your countertop.