[Tom Edgerton]

Sergio--

The color harmony in this piece is better than you think. There are but a few adjustments and I believe that you'll be finished.

I perceive a cool highlight/ warm shadow scheme. The extreme saturation of color in the shadow side of the face is atypical, but very effective and unexpected, so it works for me. I would look at warming up the deep shadow areas in other parts of the painting to go along with the head, as in the hands (especially), chair and background. Notice I said warm up, not lighten, as I believe that the shadow values are correctly observed now.

Once the synergy between warm and cool in the head are brought into other areas, the painting will harmonize overall, and really start to work.