If you see a picture or drawing, and then
draw your own picture based solely on that work (or several works by the
same person), you've created derivative artwork.
From the same web site you cited:
"To constitute a copyright infringement, a "copy" must be "substantially similar" to the original work. If your finished illustration looks different from any of the originals you used as a reference material, you shouldn't need to obtain permission."
Mark Arsenault
President, Gold Rush Games | http://www.goldrushgames.com
Executive Director, Game Publishers Association | http://www.thegpa.org
Director, Game Industry Disaster Fund Auction Fund Board | http://www.gidfa.org
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Action! System Update: http://www.action-system.com/
