Smaug and his hoard

Invited my parents to the cinema, had to draw a voucher, decided to go see the 2nd Hobbit movie, thought dragons and the coins would be easy with brushes on photoshop...boy, was I wrong. Took me 4 days of many hours because I had no idea what I was doing XD. Only the base of the middle-scales was done with a brush (self-made), but, for the coins I used one and I think it worked ok...  still has some flaws, but it was actually supposed to be simple D:.
Design was just something I made up as I drew, thought the movie-version was boring, too...
also, why didn't he have some of his treasure on his stomach to protect him?