[eldavojohn]

Originally Posted by Rian Fike

She was pretty mad when she saw the forgery.

Forgery's a pretty strong word, wouldn't you say? Did they attempt to deceive you into thinking that that sketch card was made by Melike Acar? No? Then it's not really a forgery. Unoriginal? Yes. Someone else's idea? Yes. But from the word forgery:

Copies, studio replicas, and reproductions are not considered forgeries, though they may later become forgeries through knowing and willful misrepresentations.

If you consider that a forgery then everything with Batman in it is a forgery of Dick Sprang's work. I think the word you may be searching for is plagiarism.