I personally like the bold colors. What bothers me is that the collar has a lot of fussy little details, vs the broader strokes of the rest of the piece's clusters. This is of course a very minor issue.
Nice, but unless you're sticking to a preset palette, you might have gone a little bit too orange for the Rockwell aestethics. His and other similar contemporary art was characterized by pale skin, pink hues and blushes. Breaking up the skintones with a light pink could breathe more life into your rendition.
You nailed the expression. Nice work!