Here's a digital sketch of Pauley Perrette a.k.a Abby Sciuto from TV series NCIS. When I was researching photo reference, I was surprised to discover that Ms. Perrette is almost 40! (Not that there's anything wrong with that). It must be a combination of her high voice, elfin features and her character's goth getup and pigtails which make her seem so much younger.
Originally this was going to be a self-promotional video sketch for YouTube but once again my screen capture program crashed halfway through saving and I lost the footage. Bummer.
About 90minutes in Painter 8 using the Pen/Scratchboard tool.