the shading on the face looks like face paint. that's because it's a bunch of mostly random blobs, which don't conform to the actual form of the face. to rectify this, study anatomy and decide upon a light source. also you'll probably get more use out of your palette if you lighten that darkest brown, you currently have no real midtones.
Not of a big fan of the big highlight on her forhead, there's no smooth transistion. You should apply dithering on the face instead of just on the hair.
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the shading on the face looks like face paint. that's because it's a bunch of mostly random blobs, which don't conform to the actual form of the face. to rectify this, study anatomy and decide upon a light source. also you'll probably get more use out of your palette if you lighten that darkest brown, you currently have no real midtones.