I picked up this Create-a-Face pad at our local toy store a few weeks ago for $5. It's perfect for portrait practice and makes for a very easy, low-prep art project. Before they got started I had the kids look closely each others faces for eye placement, proportion, and shape of features. Pencils, colored pencils, markers, stickers, colored paper, glue, buttons... just throw it all on the table and watch them create!
Peter's portrait - I love this
And here is another face I keep seeing this week. The I've-been-sneaking-Easter-candy face with the blue-tinged lips. At least he's honest about it. : )