That's really well achieved, seeing as your path into pixelling is hard work, rather than talent. Your concept of shading, nice colour ramps and such is on a good level, i'd say. Also dithering is working well.
May I suggest that you polish this a bit further with, say, a bigger piece? For exampe, to take some lines from the lineart thread and color them? That way, you'll have a good opportunity to study the original lines, as well as an opportunity to get quality feedback from us, the forum members <3
You know we'll be standing by ready with the best critique and edits we can manage

<3
Right now all I can say is Move On! That is, if you feel like it. :]