I can't seem to get to the top of the dragon's head. Using levitation or spinach I can set myself at the very tip of the nose, but can't proceed further left on top of the head. Using levitation or spinach again to go more up and left doesn't work. I can go up, but not left. It's like there's a wall there. Other people have noticed this issue but it seems sporadic. A person might be able to get up there once, but not the next time, etc...
I don't think it's just a matter of skill. As I said, the same person was able to do it once, but not after that. I never seem to be able to do it. :)