It's amazing what you end up doing when you have the back of an envelope and a biro in your hand...here is another pic of Dean Winchester, that doesn't look entirely like him, but if you squint you might say, "Ooooh, yeah, maybe.....hmmmmm," or perhaps, "Feh!"
I tried one of Sam....it did not go well. See, I'm all about the eraser and having the ability to reboot, so freehand envelope sketching is....so not me! I'm actually impressed that it looks like a human! (Again, taken with ipod so reproduction not that great.)