Okay -- being afraid of heights, this one gives me the creeps. You've suceeded with the deep depth of field or it wouldn't bother me to be looking down!
Ohhh, good one. Great subject, nice job. It would look even better if you cropped this by cutting 2 inches off the top. Then it would be a much stronger effect I think. You should have also titled to the right (a lot) in order to remove the out of focus rock on the left. :)