This isn't bad at all, though personally, I would have made the big monster dude a bit more bad-ass then that. But that's just me.
One more thing, The title seems like a bit of an oxymoron to my eyes. A hero is [by definition actually] NOT cowardly. I'm willing to accept on faith that he's doing something heroic like saving a princess or a wagon full of blind orphans, but no matter what it is, he is still there isn't he? That doesn't seem cowardly at all. Even if he is about to fudge himself. He's standing his ground, and it's very heroic of him.
Good pic though!!! Really.