Well, i am indeed aware of those changes you mention (eyes style and hair, mostly). They weren't actually intentional, merely a side-effect of my lack of mastering of The Gimp tools.
And now that you point it out, i remind i indeed used brushes rather than true pixel art .. probably that's why the character sometimes looks odd: i'm lacking a common style when drawing it ...
Thanks for your comment ... I'll try to redo it "the way of the pixel" when i'll have a bit more spare time, and will come back for more C&C.
PS: yes, i'm a linux guy who had no idea of what graphic gale was 2 weeks ago, and who still has no idea of what could be a good pixel editor in Linux.
What do you want to learn pixelart for? do you want to animate? make tiles? perhaps portraits?
To have sprites and blocks for my console games.
mockups on my blog may give you a better idea of what kind of stuff i usually do. The character here was an attempt to break the typical 32x32 canvas i work with ... but tools weren't appropriated, obviously.
I'd like to improve my skills on larger area pixel-painting too, to be able to build good-looking backgrounds as well (the kind of thing in the thread "a mockup is growing / a boy is running"). I'm mostly a self-learner so far ...