Step-by-step: Depict long hair blowing in the wind
1 I first sketch out the basic shape of the hair that I want, keeping in mind the shape of its movement and the basic 3D shape that the hair is built from. In this example, the hair is making a large waving curve shape, so I make sure that this form is pronounced and dynamic. I then break the shape into basic planes.
2 I add detail to the hair shape with line art to define the smaller hair groups. I do this on top of the rough-sketched basic hair shape on a new layer and use a small brush that has Shape Dynamics turned on, Minimum Diameter set to 0 per cent and Transfer turned on, with Opacity and Flow set to Pen Pressure, set to 0 per cent.
3 Then I add the colour and lighting to the hair, thinking of the 3D shape it makes and using this to work out where the lighting hits it and where the shadows form. I clean up the hair, by motion blurring the tips and Gaussian blurring more distant areas. I also soften the lines by blurring to soften them, but not removing the detail.
Add dramatic flair and contrast to your image by making the most of natural light formations such as crepuscular rays, ambient fog and rim light.