This is the image that i had based sisyphus on, it's another drawing of sisyphus with the boulder, there wasn't too much to go on but, long brown hair/beard and a loin cloth.
I can see how it would be mistaken as bitey but this is what i was going for, just in a more cartoony feeble style. Hopefully this will resolve all the issues.
Sisyphus tries running away from the boulder thinking he can get away but because it is a punishment by the gods he can never get away from the boulder, that is what happens in the running scene. The myth describes sisyphus as very witty and crafty, i tried to put this across with the whole running away thing.
Just that a few of you have been confused by this! :)