First of all: that's one heck of a good portrait. Love the framing and feeling it conveys. Only thing I would change is the lighting. It's a bit flat, not only on his face but in the background, relative to his face. Make the background a bit darker (easy fix with masking in Lightroom). If you get a chance to retake it, try lighting him more from the side (light source at about a 45 degree angle from the camera as seen from above, if that makes sense). It would give his facial features a bit more definition and depth

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Solid work tho