Alessandra,
The drawing from sculture and the figure is fine. I think your approach to the painting shows a lack of proper instruction in painting, which in my opinion you should be getting from your school. There is no way in my opinion to help you with what you have done.
There are two books in English by Harold Speed which gives you the basics. They are the practice and Scienc of Drawing and a companion book on painting. Ne has the student start painting only in black and white and from life. Another useful book is "How to Make Living Portraits", by Laura Carter Clark. It is a nice basic book for beginners.
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