I may not be qualified to comment as I am still early in my photography path and have not won any comps as yet but I am sure I am qualified to tell a worthy shot and a not so worthy photo. I have seen quite a number of your photo's and I do beleive you are short selling yourself. I have seen some cracka's you have taken and should definately be entered - abd of course, no ever shot is a cracka but you already know that ;-). I see it this way, first your photo's need to be good enough to enter of which yours definately are and secondly, educating yourself to the style of photo the competition is actually looking for which you may or may not have but you will gain knowledge from entering such comps - definately go for it. OH! and proudly brag on AP when you win the big one :-).