Hi Rui,
I think the modeling of the head is very convincing and I especially like the contour of the face, how the edge is sharp in the light and get lost in the shadow under the hair.
You might want to avoid that too many lines meet in the same point, like it is the case in both sides of the neck where the hair meet both the neck and the shirt. On the left side you can count 6 lines pointing together.
The problem with such meeting points is that you won
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