Hey, Chris. These are good start. I know these are color thumbs but try to take it little further. I really like the lighting of green cave with spot light from the top. I'll do these color demo in the beginning of the class this week.Also, I'll put up some samples i did this week some time today. #4 with the snow has great shape in there. Try to define the big abject in the distance little more as well. Keep it up.
I'm liking the 8th one. I think the gradual change of temperature is simple, but it works. Also, I think that comp had the most legible value read from the previous week, so it really translated well when you brought it into color. nice job chris.