Dean wasn't usually very comfortable around Slytherins. He'd learned to watch his back. But Nott was just quiet, and watching, so Dean settled in. It was a good few minutes before Dean shifted, stretching a little against the cool stone and looking at Nott. Dean sketched people about as much as he did anything else, but Theo might just get brassed if he did. "The shape of their heads is a bit odd. Not quite like a horse. Hard to get right from far away," he offered. Just for something to say. It was true, though. The sketch was coming out a little too equine, not quite alien enough.