...not to my knowledge
I'll let this slide but I'm no so sure others will be as kind.

Actually, if you'd bothered reading the rules at all--Terms of Service, Privacy Policy, Code of Civility and Submission Agreement--you'd notice that Sheezy's pretty clear regarding artwork you didn't do yourself. I can't remember where exactly, since it's been a long time since I've read them all, but it's written that, regardless of having someone's accord or creditting that person, you can't submit their artwork. (Goes without saying that doing so without the artist's persmission, without their knowing, is considered theft.)

Though I am happy you got the point and removed whatever you'd submitted. :)