I'd say don't be afraid of the dark. A few years ago, I'd call what you have here "dark" but then we remodeled a basement bathroom. Because it would be used primarily by the men in our family, I left the choices up to them. They chose a dark, dark tile (with black, slate, chocolate tones and a slight sheet), and we used it on the floor and in the shower. It's my favorite bathroom in the house--the darkness is warm and cozy. Proper lighting keeps it functional. If you like a darker color scheme, I wouldn't hesitate to go even darker than what you have here.

I also like dark tile for some bathrooms but of the two, I prefer your original combination.