Alessandra,
I think that you have already proved to be a competent painter.
The "problem" with this portrait is that you have chosen the wrong reference.
This is a typical fashion photo. All you see is make up, lipstick, eyeliner and powder to hide the skin colors. This outfit is then again washed out with a huge lamp ( you see the reflection from it in the eyes).
The lady certainly is beautiful but unfortunately we don
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