Are you peeking at my underpaints?

There's a conscious effort on my part here to create some interesting colors and optical effects by laying in some complimentary colors as underpainting. You can be the judge as to how successful this is when I'm finished.

I did this kind of underpainting in the composition at top. You can see traces of the orange underpainting peeking out from beneath the pale blue surface on which the two shells sit.