How did you get them to do that? I'll be even more surprised if you tell me it was a natural occurence! I think the content itself is stronger than the image as a whole - composition isn't great for me - I think a landscape would work better with the "shape" of the snail group as a whole - and the top third seems a little dark. Also think it's a shame that the shell of the middle snail is cropped slightly by the right edge of the frame. 8
I really like that you found three, It is still tough to tell scale in this shot since leaves come in all sizes. Also unfortunetly the one part that seems out of focus in this shot is also on the one third line and where the leading lines of the leaf lead too giving it undo attention. My final wish is that the littlest snail the "minature" one had more of it's head out to match the others.