Actually, this is a note to myself as well. Here is an image of Sam which I have done totally with a sketch I made with a graph. I knew it Should be almost exact but something didn’t seem right. I used a piece of tracing paper to double check the image. I positioned the tracing image and used a flesh colored paint to transfer the second image over the first. As you can see, if you look closely, the only thing off is the bottom of the ears and the bottom left side of face. I took another photo after touching up the under layer. Now, with just those minute tweaks, this likeness should be good.
Diana Williams Portraits 