An important thing to remember about darker skin tones is that highlights, rather than shadows, create forms. At a pixel level, this means you could do away with the outlines around the nose. The orange highlights and eyes stand out too much imo, you need some kind of buffer (e.g. the next lightest purple). The dither doesn't bring anything positive to the piece.

In my edit I lightened up the background and used that lighter purple as the base skin tone.
 

heres another color edit, from jeremy's

sense I made the face more red I tried making the shirt even more red so the face looks less red by comparison.