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Now I got reservations.
My teacher says side-view of a head is about the hardest to draw as 3D, i.e. the structure of the head has to be conveyed in a more restricted environment i.e. the 2D that I was talking about. And this is really hard. The skin of a face, especially a little bit sagging as a result of age must be expressed with accuracy and discipline. The high range of colours made me confused too. Greens, yellows, ochres and pinks all seems to appear on the same spot.
Nevertheless, I've also made much correction on structural defects. Notice the shift of the ear to the left. Will continue to improve on this.