Hey, thanks for your contribution to the artisteem community. You may want to have another look at the contest guidelines as you lack following points:
3.1. Write [CO] in the beginning of your title
3.4. Source
With source is meant a link to artists publication. In this case it could be his steemit post presenting the sculpture.
Visit Artisteem Discord to chat with other artists or get help.
I would prefer that it is more mind over matter... meaning you should look more at the content of a contribution than at its lack of some bureaucratique formalities...