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It seems that you've taken on a very difficult challenge, working from what must have been a photo with flat lighting (probably flash). You'll find much greater success working from photo reference that is taken with natural light, especially light that's not frontal.
As a start you might want to practice drawing simple monochromatic forms in three dimensions before tackling such challenging subjects. Rendering three dimensional shapes as they turn in the light, mastering symmetry, etc. are all essential skills for an artist to perfect.
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