
Patrick Troughton. The Second Doctor. Version Thirty-two. Colored.
Reference was from Tomb of the Cybermen.
I went back to a reference photo I also used to draw Patrick very early in the project, as version 7 [and 20]. I always liked this look for Patrick and wanted an improved piece from the same reference. Hair and costume are taken from version 20.
Version 20 was from the same reference material, but came out quite poorly - I think because I was trying to simplify his face, make more sense of it. This time I included a lot more unusual detail to capture Pat's face.

Frazer Hines as Jamie McCrimmon.
Reference from The Enemy of the World. Again this is from a reference image I've drawn before, very early on, as version 2 of Jamie.

Deborah Watling as Victoria Waterfield.
Reference from Evil of the Daleks. This was again based on a reference image I drew very early on, as version 1 of Victoria. Her body is a reworked version of a body for version 4 of Victoria.

Anneke Wills as Polly.
Her hair and costume is in a similar style to what she wears in the Moonbase.
I draw the hair [and everything else except the face] with the mouse in Photoshop, using either the brush or line tools. I scribble the hair somewhat loosely, working in as much detail as I can, mostly following what is visible in the photo. I then use the Median tool over and over [combined with brightness/contrast] so that the strands of hair develop black areas where they meet, and take on a particular organization and shape. I make areas of the hair lighter or darker using the dodge and burn tools to guide how the hair organizes itself using Median.
Once I'm done, the hair has a complex structure with nice areas of black rather than just a lot of lines.