aside from the anatomy problems
The one thing that bothers me is the black outline, and the chunky bits of outline in certain areas
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ya see where i circled, is those odd chunky bits
makes it look jagged in weird,
pixel art isn't just drawing in MS paint. it's harder because you have to pay attention to the pixels
pick your colours carefully, On rule, never use default Paint colors :V
, and dont just use black outlines, it looks weird. for the skin, use a darker skin tone to outline, etc.
take a look at the pixel sprites from Pokemon games and such,
http://www.derekyu.com/?page_id=219i found this tutorial online, its for PS, but im sure you can get those same results in Paint.
you're using a touch pad no? I think you should at least use a mouse. it'll make your life easier ouo