You've chosen a very difficult reference photo to work from. Having good reference is three quarters of the battle. Inventing colors and working with such flat lighting would challenge even the most experienced portrait artist on this site.
You might want to study the tips in the Forum section on taking your own reference photos, or as Jeanine suggested, try and get some practice painting from a live model. It will be much easier and you'll be happier with your results.
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