QUOTE (dcorc @ Dec 30 2009, 06:26 AM)

OK, looking at your portrait drawing, the problem is that you are "drawing symbolically".
What I mean by this is that you are drawing symbols for "an eye", "a nose", "a mouth" and so on - you are representing an idea instead of drawing what you see.
Don't think of "features" as being separate from the head - in fact, try to forget that they are "an eye", "a nose", "a mouth" and so on.
Just try to think of the head as being a solid block - those parts turned towards the light are lighter, the parts turned away from the light are in shadow, and those parts where the surface is almost parallel to the direction of the light are the half-tones.
If you break down the face, not into "features" but into areas of light, halftone, and dark - or even, initially, just into light and dark... just get the abstract shapes right, and you will have drawn the face.
It's helpful, at first, to draw faces (or anything else), lit by a strong directional light-source. Once you can show 3D form with that sort of lighting, you will be in a much better position to draw things lit by more subtle or more diffuse light.
Dave
Great post.
I would suggest doing a WIP thread of a new portrait and letting people in here help you along as you go. Start by posting your reference. Just be in no hurry to get it finished and enjoy the process.