Yeah, I've admired Alvin's art for a long time. Check out his earlier gallery where he did a "freehand" sketch with a mouse(no graphics tablet!) of the Wolverine character in Microsoft paint!  I love the work of all the other artists mentioned here so far. 
Another phenomenal Bryce/Poser artist who has since moved on to C4D is jjsmlee. You have to check out his stuff if you enjoy great Sci-Fi work. http://www.renderosity.com/mod/gallery/browse.php?username=jjsmlee&page=1