” Single Flash Limitations :
A single direct hot shoe flash regardless of where it is positioned will create sharply defined dark shadows because the size of the lightsource is small and there is no secondary light source to “fill” and modulate the tone of the shadows. ”
“When a flash is raised directly above the lens, the head shadow falls down behind the shoulders out of sight. The potentially distracting nose shadow falls below the nose in a full face view or behind the nose in an oblique view where is it barely noticed.”
