Here's another comparision of my reference to the final product. As you can see, I change some stuff to match the feel of the piece. So for instance, if someone is smiling in the photo, but I want them to be serious, then I change it. So, I don't copy the reference line for line. I just try and use it as a jumping off point and then try and make it my own. Hope this helps other artists to show my strengths and weaknesses and how I work. Enjoy.