>>2876001you removed all the highlights from the hair of the girl on the left, and some from the girl on the right
there are chunks of white between some of the hair strands
the outlines look really aliased (I think that's the word?) and inconsistent
it looks like you used a tool that selects a region based on color - try tightening the sensitivity, turning on anti-aliasing if you can, and manually removing from the selection any bits of hair that get in
