To keep it feeling aged, I stuck with the Toner Gray selection of Copic colors in Autodesk SketchBook. The ever-so-slight yellow-y tint gives it a nice aged feel without it feeling too digital and clean. I went with a straight white for the eye and the tooth to give it that pop like it was masked off while the rest of the image was being colored.
Proph's look is pretty much my own when I can feel folks staring at me. Considering the end product is meant to be stared at while waiting for me to broadcast stuff... yeah. That uncomfortable expression fits all too well. = )