Most of you have a photo from class that resolves well into a series of layers. In addition to finishing that piece, try the following, if you have time.
Make a simple drawing outlining the major shapes in one of these photos, below, or one of your own.
Block in the first layer everywhere.
Save that piece of paper as is, and make another painting of the first layer with the second layer added. Now you have one page with one layer and another page with two layers.
Do a third page with three layers. If the image requires a fourth layer, such as a few super darks, add them to the third layer on that same page.
If everyone brings in three pages, we'll have a wall full of step-by-step demonstrations to learn from!