u had a idea but 2 get crack effect better if u use crack earth texture for example , i also so think the hall for coin is 2 small and u have to wrap it, like that looks flat, good luck

link to crack texture: http://www.sxc.hu/photo/875748

theres something that looks odd about the head part .. i try to explain, the coins are flat on the table but if you look at the head it seems be floating also theres no reflection from the coins and there is lot of others

cute idea- the coffee pot kinda takes away from the rhino