The fellow selling those drawings on eBay has just changed the listings. They now say…
I was asked the question on who had drawn these. I thought it was Mark Evanier, but informed that they were drawn by Sergio Aragone's and then signed by Mark Evanier. So These are being sold as drawn by Segio Aragone's and signed by Mark Evanier. Wish Sergio had signed them to.
To make it clear: They were not drawn by Sergio. They're so amateurish, I can't believe anyone would think they were drawn by Sergio. I've e-mailed the seller and informed him, and I bet he'll do the right thing and cancel the auctions. But this is a great example of how you need to be cautious when purchasing artwork.