Hi Tito,
This is a wonderful rendering, the work looks very mature and I could not find anything wrong with it, especially after you changed the highlights in the eyes. That lock of hair in the front is sort of funky looking and makes me wonder how the portrait should be dated, since that type of hairdo is reminiscent of a different era.
I met a young art student by the name of Jim Nam, who works exactly how you are approaching this piece. He showed an absolutely gorgeous under-painting and proceeded by tinting the image with very thin transparent color glazes. He said he uses transparent Blue Oxide, Alizarin Crimson, Yellow Oxide, Red Oxide and Flake White 1 and 2. He called his medium a Gel medium, which consisted of a mix of Copal and Walnut Oil or cold pressed Linseed Oil mixed in Brazilian Turp. His brush strokes were short dabs and reminded me of impressionistic paintings. I have not used this combination of medium myself and since this young man was from Vietnam, we might have dealt with some miscommunication or mislabeling. I am curious if you know of these mixes. The end result was phenomenal and the skin looked like it was pulsating with life. If I can find him and convince him to teach me his technique I will share the experience with you all.
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