The toughest thing...
It is one of the toughest things, to get the right shadow colors from photos. Painting from life, it is remarkably easy in comparison. Shadows must NOT be intense re: chroma. As mentioned by others you have hints to go by in the photo. The white shirt will help you to read the color of light and then you can extrapolate to find the temperatures of the shadows (to some degree).
The problem is that cameras don't read shadows very well. If you were working from life you could squint at the ACTUAL subject and compare your subject to your painting and the answer would come to you quite naturally. Can you get him to sit again? Adjust this from life if you can.
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