Don't worry about it, Mecha, you're hardly the only one who thought it was a real cover to a real comic. Today when checking the cover out, I noticed that there are many other sites that where it is featured with no indication it's not a real cover.  So IMO it's understandable that it was submitted as an entry here.  

At any rate, I think it's an interesting piece of art and others thought so too--it got votes and "likes."