Uplighting illuminates the recessed cove.
Natural light pours through the window in the shower.
Lighter colors on the walls and flooring help reflect light. Make sure to select a floor tile or material that is nonslip or honed to reduce the chances of slips and falls.
The darker vanity and shower seat contrast with the light materials for visual cueing.
Wall sconces even out the overall lighting and decrease shadows at the mirror.
Although there is no downlighting visible in this photo, the overall illumination of this space is well balanced.