You had to really be looking for this guy. The only thing that couldv'e made it better is had you been able to pull down that leaf in the lower left corner. My attention is drawn to that... otherwise, clearly focused on the snail. Nice work.
The grass at the front is kind of distracting and your snail is partly hidden. A different shooting position might have worked better, or at least removing the distracting grass. I don't think the snail would have run away that fast :-) Good usage of rule of thirds and your main subject is in focus.
Nice find! They are hard to find, I know, when I did a project for the Pre-School hour I had to go to a fish store, couldn't find them in my garden! At first the grass in the front is a bit distracting but upon looking more it does add to the shot giving the sense of hiding to start with. I'm giving you a 7 to start but it may go up as I come back again.