May I suggest that you incorporate the contrast as you go along, thus eliminating the redundancy of redrawing over the same territory.
I cannot comment on the form, as there is no reference photo. However, it appears that the face is too long between the eyes and nose, and/or the features are in and out of size proportionate to each other.
I draw portraits one line at a time. Each line must be correct in relationship to the lines I just drew. Some use other methods of positioning of key points. What is your method? What was your procedure in this portrait?
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