Dear Ilaria:
This is pretty close to the technique I use and have a few suggestions at this point:
1) Establish the background now before you work any further on the figure. It will play an important role when creating your flesh tones.
2) Watch the edges. When working on the background, try to soften and vary edges not only with the background paint but with the white as well. It's trickier to soften edges with this technique, but possible.
3) Re-study the hands. Make sure your drawing is correct; making changes late in the process is difficult.
4) Try to complete all of the large masses like the shirt and pants first. These masses have the same effect on flesh tones as the background does.
5) Have a color idea for the portrait in mind or better, on paper, and know which of your pigments are transparent.
6) I'll give you a few tips on glazing when the time comes.
Please feel free to e-mail me with any questions.
Scott
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