I hope you continue joining in artisteem. We're helping them weed out the spammers so keep on uploading your artwork there. We need the genuine artists there!
Here's their latest guideline. So your entry might have been missed because it didn't follow the artisteem guidelines.
https://steemit.com/artisteem/@artisteem/notice-artisteem-posting-guidelines
https://steemit.com/artisteem/@artisteem/guidelines-for-co-cr-and-cu