Hey man! This is only my second piece, so I'm still getting used to everything. Thanks a ton for the feedback! 

Hi, and welcome to Pixel Joint! Regarding this piece, it has a very high color count, one can tell is the skyline, and the border of the mountains. Although it is not a general rule having low color counts, it is frowned upon when a simple piece has too many colours, because pixel art should have pixel-level control of the piece. Having too much colors means that drawing tools that blur or mix colors might have been used, automatic tools in other words. I could go on and on about this, but right here is all that resumed and explained in a very simple-to-understand way. I encourage you to clean this up, and give it another go! The animation on the scarf is pretty cool