This time I tried another variation. I worked from photo reference but tried to use my imagination to slightly change the position of the light source, basically just as an excuse to test out my knowledge of planes on a problem.
I'm not too pleased with the result but that's more a consequence of the drawing being a bit poor. With hindsight I should have spent more time look at the reference. The head angle for example is wrong, and there are simple problems like one of the shoulders not being at the right height. I think the imagined lighting looks alright though.