I've checked your upload. It was initially approved by a mod.

It's probably not bad enough to be deleted but it's not very good either. The character has been vectored by vectormagic or another automatic vector tool, and there's some jpeg artifacts in the background itself.

In any case anybody can see the reasons why it was deleted by going directly to the post, or by clicking on your username and then on the deletions list. Is not that we hide why it was deleted.