I have an irrational nervousness about using practical color in my illustrations. the whole permanence of it which is why I am a prominently digital artist (gotta love the undo button). I have been gradually been trying to overcome this, in this case I finished up the sketch at work while rendering video(I'm in the middle of an HD graphics package upgrade thus I have a lot of rendering to wait threw). With only limited colored pens available I colored the dalek predominantly with two highlighters, the few accent colors I added was using a paper mate "flare" and a blue Bic "Mark-it" (which I have no idea why is in my desk) later I attempted to use some pale copec markers, sadly they were too pale to show up very well in the picture but I assure you they are there.
as a bonus pic since I have been gone from LJ so long, here is a quick head sketch of Captain Marvel I completed on my desk calendar while making phone calls.