These are the cutest snowmen! I found them over at Exploring Art (Abby Schukei) and the kids are loving them. It has been a really fun way to learn about creating form by using value.
Here is mine (which I did in paint but then decided that I liked the idea of using oil pastels better.)
This is an accessories-free snowman so they can really focus on just the shading and form.
Some student examples!
tinyartroom 