the hair looks flat because you're chosen to depict it using a pattern rather than volumes. overall the piece has too much dithering and not enough aa. you're dithering a darkdark grey to a light grey, even though you have midtones in your palette to ease the transition. outlines are jaggy. lips are dark and oddly shaped. in summary, this piece could use a little more work before it's ready for your gallery, I encourage you to start a thread in the WIP forum for feedback/advice/improvement, we'd be glad to help.
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the hair looks flat because you're chosen to depict it using a pattern rather than volumes. overall the piece has too much dithering and not enough aa. you're dithering a darkdark grey to a light grey, even though you have midtones in your palette to ease the transition. outlines are jaggy. lips are dark and oddly shaped. in summary, this piece could use a little more work before it's ready for your gallery, I encourage you to start a thread in the WIP forum for feedback/advice/improvement, we'd be glad to help.