You cannot repost someone else's artwork in your deviant gallery even if it's for promotion. You're basically stealing it with good intentions. If you want to promote it, make a journal entry. As you can see from the comments, almost everyone assumes this is yours.
Yes I know this, so do most people. For instance I take a drawing I have done, change it in Photoshop etc. This is now classed as Digital art or photo-manip? You need to make these things clearer to everyone. Thanx for your reply/