If somebody criticizes your work, listen to their criticism - They may be far more valuable than you think. Art is more about the audience than the artist, so as you yourself have a different perspective to the audience, the audience's view can make an absolutely shit work a masterpiece.
I'm also sick of people flaming the more knowledgeable members of our GFX community - so for example, if any of these artists comment on your work, the likelihood is that it's true:
- Jack Goff
(Sorry about those who I have forgotten to include).