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I know painter very well but i am using gimp now because i am on Linux.
Painter is best for art painters . I am satisfied with gimp because i am not looking for visual effects for now. Your work is very good . I have seen your work on the other site also and i liked it. I have already left a question under one of your posts already.
I don't know Pixelmator.

I knew you were awesome for more than one reason. I love using Linux too. Yeah GIMP is a great program.