Who's the artists that drew these images?
I'm mainly interested in the X-men one, but curious on the others as well.

http://www.amazon.com/dp/B005PU9XEO/...=IA25LGS7H5YKN

http://www.amazon.com/dp/B005PU9Y3O/...I38UZZ0TXCQQTP

http://www.amazon.com/dp/B005PU9X62/...I3B0IXGS44MS8J

This site might help; better pics at least. http://peavey.com/products/marvel/ElectricGuitars/

The X-Men one is Art Adams. Not sure about the others.

I am almost positive the X-Men art is done by Art Adams, the others possibly as well. I think the X-Men art is a swipe of a "Classic X-Men" cover (that was a reprint series). He was a pretty famous cover artist for Marvel Comics:

http://marvel.wikia.com/Category:Art...s/Cover_Artist

And Greg beats me out posting about Art as I went to hunt down his page on Marvel's database.

X-Men one is Art Adams.
Spidey one might be Mark Bagley.
Wolverine one is John Cassaday.

Spider-Man is kind of a tough one; a lot of artists tend to draw him the same way and without any facial features, it's kind of hard to identify a particular artist's style.

It looks like Bagley to me too, Josh.

Yeah, I was thinking Art Adams on the X-men, but I thought it was from an Uncanny annual. But when I looked at Annual #10 the art made the characters looked childlike and it didn't match the art style on the guitar. I had forgotten about the Classic X-men cover though.

Bagely was my guess for the Spider-man one as well, but its really hard to tell.

Here's a few more of their guitars. I'm thinking of buying a few to get autographed if any of the artists happen to be at one of the Wizard cons I go to.

http://www.amazon.com/dp/B0091DR5FA/...I20B6BYLHJQ3J8

http://www.amazon.com/dp/B005PU9XUI/...I17DDQKYVA5ZD1

http://www.amazon.com/dp/B005PU9XEY/...I1C86V48M9R10J