I hate to be that guy but I recently stumbled on this.
This artwork looks exactly like a GW piece (can't remember the name of the artist, but it definitely has his style alongside much of the other lizardman artwork he has done for GW).
I was wondering if anyone else has seen a larger image of the above artwork kicking around anywhere, so far google has provided me with precious little else.
Image taken from this site.
[url]http://waaaghwarhammer.skyrock.com/2.html[/url]