This week's homework.
Pick and refine your environment thumbnails.
Try one good value sketch of each of your favored environments. Two pages minimum.
Good luck on the sketches this week!
Also, on a side note, Vahe brought up the program "Alchemy" in class. It's a silhoutte/shape creating program; still being developed and working towards a full release. For right now it's free to download at http://al.chemy.org/ as long as you decide to join their mailing list.
Have fun with it!