I started this sketch a couple weeks ago but with the Jersey Fresh Graffiti Jam coming up I let it sit. Started out wit some mechanical drawings in colored pencil. Added some water color filling in areas, but also blending, and splashing.
Added a skull with ball point pen as the main image tried to keep it translucent. Finished it with some shading with water color and colored pencil.

First Sketch

adding some color

Finished Piece "Translucent Skull"