Sculpting the head

Head sculpting has always been a challenging task for me, particularly because my knowledge of the anatomy has been poor, along with using really bad reference material where the lighting fails to truly catch the shape of the head, or heavily made up celebrities with poor camera angles. I have decided to once again take my time sculpting the head as I had previously done, but this time do it over time, rather than complete it at one sitting. This means that as I continue to look at the head at different times, I will have different perceptions and hopefully be able to see my mistakes clearer.

This was the first sculpt I did. Mainly using my 3D SK reference material, trying to get it as close to her as possible. However there appears to be a few issues with it.

-Lack of detail on the ear (what if I wanted to have her without the good?)
- Dimple on the chin seems out of place
- A large bag under the eye makes her appeal old (supposed to be in her early 20's)
-Space above the lips appear to be too deep
- Too rounded head, although she is female it appears to be too oval, not having any depth

I then decided to try again at another time. This time using the best parts of different women, and my own creativity.

Cassie Ventura (http://userserve-ak.last.fm/serve/_/5522/Cassie.jpg)

Unknown model (dance.net)  : Head Shape

Sabrina Maree: Cheekbones (Modelmayhem.com) 

Erika:Lips and nose(3D.Sk)

In order for me to kind of focus on the eyes, and not the cheekbones and other parts of the face, I used the models of the mask and hood. This really helped me concentrate on just the eyes, or the whole face. (I find it hard looking at a bald model in Mudbox at times).