Wow, it kind of reminds me of a graduating class. The bottom layer are Freshman students, the objects in the middle layers are the Sophomores and Juniors, while the top layer represents the Seniors with the most maturity. While in the middle layer off to the left there is only one wing on the creature which could represent a student having trouble in life/school. Well, thats what I see when I look at this picture. Very good work here. It tells a lot! (for me)