OK... this is a bit of a milestone. Didn't get to this point on the first version... All of the panel has been underpainted. There is no white! The values are kind'a crazy and not really close to being right, but the colors are generally indicative of what they will be in the final...

Woof! Now the work begins. Visualizing the composition is relatively easy for me. Visualizing how form takes shape and recreating it with paint is more difficult... That is the focus from this point on.