head/face sculpting

Am a blender noob and have been trying to sculpt realistic head shapes. I can draw realistic faces but this hasn’t yet transferred to 3d art.

Here’s a female head I started. Any comments/constructive criticism/etc regarding general facial dimensions are well appreciated.

[ATTACH=CONFIG]452273[/ATTACH]

[ATTACH=CONFIG]452274[/ATTACH]

I can only see one image, and it is not the entire model. It is a really early stage, so I think any critics are to early to make. Just keep working and post it when you have blocked the entire face.