Beautiful portrait, you're very skilled. In your painting there may be more contrast between the treatment of the head-covering and the head than what I'm able to read from this photograph, but as it's reproduced here, I'm thinking it might be more effective if you broke up this monochromatic unity. The degree of finish in your brushwork is the same, but because of the color treatment, the turban comes across as unfinished.
Anyway, beautiful work, and if you posted this in the "unveiling" section, there wouldn't be any critique.