I have not seen the original drawing (the link is dead), but I'd like to talk about the principle of the thing. My brother is a freelance comic book artist (Marvel, DC, etc.) It took him a very long time to get as good as he his. One of the things that he told me a long time ago is that he'd rather have a critical eye look at his work than a gilded tongue to praise it.
As an artist you're never going to please everyone, but if a person takes the time to critique an image, it is usually worth listening to. By critique, I don't mean "that sucks", but meaningful comments on proportion, line density, shading, etc.
Currently, my son has taken an interest in drawing manga. While I'm not stingy with the praise, I do offer the critical eye and make sure that he has the proper tools and books to steer him in the right direction if he decides to follow my brother's career.
As an artist, if you're going to show your work in public, you need a thick skin. I don't know of any job that gets more flak and rejection than drawing.
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TAZ
PS. My brother is Patrick Zircher. Since he's a freelancer, his titles are all over the place. There's a pretty cool interview with him here
http://www.comicboards.com/interviews/zircher.html if you are interested on reading up on how he got into the comic business and what titles he has worked on.