Grisaille to Color in 3 hours

Erik Koeppel Grisaille 9am (made with burnt umber and white)

Colored painting at noon

This painting isn't finished yet, but I hope it gives an idea of how useful an under-painting can be if it's kept light, and has good warm/cool relationships. Now I just have to spend a few months refining it. 

Palette used (Burnt Sienna, Yellow Ochre, A mixed Royal Blue, and White)

Thanks for reading.