Ambient light with additional lighting
When the lighting is too harsh or limiting it is normal to use some form of continuous lighting, speed-light-reflector-modifier. This is something any good photographer will understand where and how to craft and shape light to create shadow, depth and form to an image.
Real scenarios below with a mixture of ambient and modified lighting.
Utilising ambient light only
Here you can see the contrast between the harbour landscape light streaming through the window creating highlights with natural shadow splitting the image diagonally.