A copy after Rembrandt's Jeremiah Lamenting the Destruction of Jerusalem, this was done as part of the OFD Wroskhop in the anatomy forums here on CGTalk.

It proved to be a huge learning experience not only in the techniques of Rembrandt, but in creating textures and the subtleties of light, dark and edges.

This was all done in Photoshop CS2, exclusively with the default chalk texture brush at varying sizes, without pressure.

Some 100% closeups