Pillow shading + Bad anatomy = a BIG no no.......

Correction:

Tutorials + Anatomy + Forum help = Improvement + Better pixel art

ha, this looks a lot like my pixels when i first tried. ^_^ Mehtyals, try to think about things like you are building them, as if they were 3 dimensions, you are not painting a 2d pixel, but in fact, representing a 3 dimensional object - for me, that is a central idea when painting anything (including pixel art)

Thats a problem, colouring is my worst part, really have no idea how other people do it so good..

The shading could be better, it looks very flat - especially the green part. You might also want to try to shade the body as a whole, as they are now, the yellow and green look like two parts.
Keep up the good work