#1 - I like the tree shadow a lot. I am not sure about the angle, but it does seem to work.
#2 - I don't care for the very shallow DOF on a landscape shot
#3 - I like this one. I think it could be really wild manipulated in PS with some extreme saturation or color adjustments.
#4 - This one doesn't do anything for me. Although it has a focal point, it is too centered for my tastes and the rest of the shot is rows of cars in a parking lot
#5 - I like the perspective, although it is dead-center, and might have benefited from you moving right a bit. If you can go back and do it again, try standing in line with the right-side wall of the bike path, so it comes into your image near bottom center.
#6 - Please do not enter this one in the Linear Perspective competition here on POTN, we have enough competition there already (hint).
These are purely my opinions, and have no basis in anything deep, wise or educated.