Turtle Stone

Those of you who are Dragon Ball fans will/might remember this one. My favourite part of Dragon Ball is the Tournament saga.

During Goku and Krillin's training Master Roshi writes his mark on a stone, throws it off a cliff and tells them to find it. The person who finds it and brings it back first will get dinner, but if it's not found within 30 minutes, neither will get dinner. From the manga.

This isn't finished, I might add more textures, or dirt etc. The shape doesn't feel quite right either. Feedback is appreciated.