Concept Art Resources

In general, edges are:

Harder in the light, softer in the shadow

Harder in bright light, softer in dim light

Harder in focused light, softer in diffused light

Harder in the foreground, softer in the background

Harder on smooth forms, softer on textured forms

Harder on hard forms, softer on soft forms (Duh, but really)

Harder on flat forms, softer on rounded forms

Harder on thin forms, softer on thick forms

Harder on still forms, softer on forms in motion (on moving forms they are harder on the leading edge and softer on the trailing edge)

Harder at the center of interest, softer as you move away