I like this picture because it complements the title!
I would like to address the exposure.
1. Over exposed towards the face and neck.
2. Under exposed shadow behind the shell.
3. Even (correct) exposure towards the tail.
This is a really neat subject, but I think the lighting betrayed you here - the light-glare on the snail's body is so bright that the one antenna appears to merge into its body and it's hard to make out any features, at the front. Nice, tight closeup, though; do you have one of those cameras that has to find a white somewhere in the picture, perhaps?
Lighting is a bit harsh, creating hars shadows and highlights, but very interesting textures and great composition. If you try this again, simply have someone or an object create shade for you while you shoot. The shadowy light is much softer and creates more interest.
Good photo for everything, but the slug's body (very over-exposed). You might want to try different white balance or different (wider) spot metering. 6 Rob the Swash
well.... its interesting :) The color is a bit washed out on the snail. The bottom of the photo is out of focus somewhat. You did a great job of stopping action here though lol