Yeah, this is one of the most famous portrait photo ever shot. Many artists are inspired by it and drew from it. Your old drawing is your valuable asset, you can always refer to it and remind yourself how much you've improved.
Wow!! I have always loved the photograph of the Afghan Girl ... she is beautiful and her eyes, what can be said of them? that gaze cannot be described, one has to actually see the photo, can only imagine what it is like in rt. your drawing is stunning, absolutely stunning and your talent is amazing.