Ok, that bottom pit does look much better. However, the top slope make it look like the pit is in a raised area....

What I was suggesting is that slope 1 be a bit darker than flat 2, slope 3 be darker than slope 1 and flat 4, and 5 being darkest. The general tendency is to see a dark slope and assume it goes down, while light slopes are usually seen as raising up. You can see that easily on the slope 2-3-4, but the transition 1-2 goes the other way. If the top green is to be forest I would think about adding another texture to show that.

Otherwise I like this a lot.