I start with a light pencil sketch. Since I do a lot of my work with graphite, I try to keep from getting to much shading with the pencil.  You only want to really add the shadow areas.  Then I add a very light coat of fixitive to hold the graphite.

I free hand the first flesh color, not too worried if the color runs into the hair.  Focusing on the shadows and midtones.  Pay close attention to the highlight areas, this saves a lot of time so you don't have to try and pull out the highlight areas with an eraser.  Plus, the more of the board you have the more realistic the hightlights look instead of trying to do a ton of erasing or trying to use white over top. As you can see, I got a little heavy over the ear,  this is going to be a challenge to fix.

Adding in some pink, going into the shadow areas, the eye lids and the lips. Again this is all freehand. I also come in with an eraser pencil to pull out some of the highlights.

Now I start adding some background with a regular brush. And then a little to the sky area with the airbrush.

Adding some more pink to the face to add volume to her cheeks.

Now, I come in with colored pencil to keep the hair detailed and seperated.

A little more fine tuning with the colored pencils in the ears and around the eyes

Colored pencils in layers to color in her jacket.  I concentrate on the eyes, nose, mouth and ears with the colored pencils. I use a lot of light layers with the colored pencils.  I figure you can always add more but have a hell of a time trying to take it away.

Adding in white highlights and strands of hair with a regular brush. Detailing some final touches like the lips.  And this is finished.