If I may ask, do you scan your drawings or photograph them? I find myself in a slightly suicidal mood after I've photographed my drawings - I just don't get what I'm doing wrong! The lighting is always crapppp and so many details get lost.
I noticed that you are well portray hair! Even in the first portrait of Marilyn this seen! I have a problem with that, though I had read enough information as to draw them. Do you have a method or is this goes by itself?