hard to tell actual tile color on monitor but I would paint cabinet a dark taupe & I just painted my bathroom BM woodland snow

The mirror and window treatment look pretty stubby for a room so tall. I would extend the mirro higher, and replace the lights with long fixtures that are more stream line. Do not use a dark grout with that tile.

I would use this as an opportunity to lighten and brighten the room. Paint the cabinet a darker color that relates to the tiles, maybe taupe, and paint the walls an off-white or cream. Remove the swag valance and update your lighting.