On this image (a photograph, not a CGI), the shadows of the astronaut, and the rock and the tripod at bottom left, show that the sunlight is from 35 degrees or so above the horizon, from southwest if the direction that the astronaut is looking is treated as north, i.e. from behind all the objects. Then why is the visible front of the astronaut so brightly lit? On the airless moon there is no "ambience" effect caused by air and clouds diffusing light.

If the cause is Earth-light or camera-flash, why are the other shadows still black?