First I would like to change the head position. For this I'm going to select the around the head area and just drag it (V + drag).

Drawing a female character



Drawing a female character



Drawing a female character

Begin to drop shadows and midtones defining the shape of the head.

Drawing a female character



Drawing a female character

I've got this line brush. You can make lines brush very easily. Just use a type tool and type: IIIIIIIIII or iiiiiiiiiii or!!!!!!!!! And then just define the brush.

I tell you, I haven't got any great result with
 
the head so I've just made it disappear. BAD BAD – example * you shouldn't fear to paint what you can't!!!!

I've also dropped some shadows with low flow soft brush.

Drawing a female character

Now the background. As it is a sketch I'm not going to create detailed background here.

I will show how to create a background very fast.

Use the flat brush I hope you've created.

Drawing a female character

Use 0% motion blurs and there we have it.
I've also dropped some bounce lights. Using low flow white colored brush.

Drawing a female character

Practice a lot – speed and quality and everything else will come in time.

Drawing a female character