The steps so far...

Here's a step by step of this painting so far.

Thumbnail (2"x2 1/2" approx)
Full value structure drawing 
Toned canvas with charcoal drawing
Lay in of shadows
monochromatic underpainting (with a bit of color because I forgot to photograph it before I started the color layer, oops)
1st pass color layer.

Kind of fun to see it all at once.