Carol,
This is a successful, accomplished piece, and I can' t offer much beyond Michele's observations. You have handled the modeling of the subtle forms of the face with skill and a delicate touch, and the edges are a likewise well managed, especially where the hairline meets the skin.
Although you note the likeness issues with the ear and nose, they aren't really anything that someone else might pick out unless they were particularly looking for fine tuning / tweaking things in comparison with your source. In other words, the drawing reads well.
PS About the stripes, I tell people up front they are not allowed to wear little stripes ( nor plaids), or if they do, I won't paint them
