Doesn't matter, i respect nero and i know he's great at providing cnc. However this doesn't mean he's right all the time.
What i feel is wrong is you made your lightsources bend and spread out too much, should've kept the shadow on his face way more visible. As said by Bglave the c4ds are LQ and the saturation is a bit low for my liking. Your lights come from the back, not the sides. Therefore they shouldn't hit the side of his face as much as they do, light doesn't bend like that in air. Slight light leaking is enough in that case. Anyhow decent piece, KIU