This is really great. I like his faceexpression, the light is perfect as always. The Simplicity of the portrait is perfect for the model and the setting as such.
And overall he has the same way of relaxed and the same time concentrate look as my pianoteacher always had. Wonderful eyecolour. I guess if you give more shadow to them they will be even more devilish-green, like glowing in the dark without PS.