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Thanks in advance!

I think the angle of his body is laid back too far; this picture would look better rotated 90 degrees clockwise. I'd say this is underexposed as his face is too dark - if you're not allowed to use fill flash then try waiting until he's looking up (so that more light falls onto his face). If you have a spot meter on your camera, take reading from the face and add +0.5

My intention with the series for this particular performer was to catch him in shadow. The lighting was a compliment to the music he was playing at the time.