This turned out to be a great study in the art of the value study! The darkness of the glass, which basically works like the background, really changed how I needed to handle the values of the images within the piece. I ended up putting the glass into a layer in Photoshop so I could easily adjust the value and decide what was working best. When I add the color, I plan on going very warm with her hand and face. I might also darken their value slightly. But for now, this will work great for the under painting.