I am not really going for an exact copy of my reference. I am rather using and developing further the expression in it. So I've developed the freckles that were in my reference photo even more in my painting as I feel it just adds to the impish nature of the already existing expression. I've also developed the lighting more to create more light and shade on the face and a second reflected light off the white pages of the book.
I still have a little work to do develop the chin a little more as the reflected light is a little too bright and altering the corner of his mouth a touch but its nearly there.