I'm a noob too, but don't be fooled by my post counts, just that I'm very active here. So here goes my noob comments:
#1: Very nice DOF but if the full "stone thing" is shown would be much better.
#2: Slanted and seems to me that its like a "peeping" kind of shot.
#3: I will like it to show more of the stairway & railing.
#4: I like this one the best maybe of its colour, cropping off a little of the right side (pipe) would look better.
Try to take these shots again and compare them with these. Then you'll know which is better.