I am a retired electronic engineer, and have taken up art as a hobby. According to what I have read, drawing should be studied before going into painting. Mr. Petrie's book has been an excellent launching pad for learning to draw. In the past 3 months I have purchased 13 books on learning art, but none has proved as useful to me as this one. I copy his drawings and am surprised on how well they turn out. I can heartily recommend this book.