Hi there, i'm new on that awesome world of pixelart. I red some tutos and I have a general idea of how it works.
Firstly, I tried to make a demon using some of the things I red (AA, shading, dithering, etc) but need some critics, because I want to make it better.

Here the pixel work:



And the reference I used (I'm not able to make something without ref):
http://1.bp.blogspot.com/_N7ebvIOKog8/Sr0Frb-QmJI/AAAAAAAAAAc/uIqmXCtape8/S1600-R/gargolafff.jpg

Edit: I experimented a bit more with the palette, but still needing some help please