While I agree with most of bengo's advice, I feel their edit goes overboard and completely changes the style (and in the case of the bird, changes the design/species), loses some readability, and loses the lovely sense of volume the original had. I think it's a good edit to study, but I think it can be difficult to figure out how to incorporate those changes into one's own work, since it's so different.
To help bridge the gap somewhat, here's a different take that incorporates most of what bengo said to a lesser degree, keeping most of the original style.
It uses more colours (14 instead of 9; original had 18) and keeps the external outlines because I feel they improve readability, but makes some similar changes to the silhouette and adds/corrects some of the same details from the reference that were missing/off-model in the original. Mostly I focused on adding the big details from the ref while getting rid of the small ones that weren't reading well (folds, etc), and removing highlights that weren't important or helping define the forms.
I kept the details and lighting on the legs because I don't think they were clashing with the head at all, the contrast there is much lower. I even added more contrast and I still don't feel it clashes.
The things I "corrected" were the heights of the shoulder pads, and the relative sizes of the boots and gloves. Looks like you struggle with keeping those consistent, OP, so that's something you should try to focus on specifically. I also made their trousers tighter (=legs thinner) to be consistent with the ref.