Piro speaks:
It's like Hitchcock - your imagination is the best special effects generator, and much more capable of being convincing than being direct.
which doesnt mean you *dont* get to find out whats in the sketchbook ^_^

Intentionally or not, her shirt has the Sega Dreamcast logo on it.
Piro's rant talks about and links to "Envelope", a side project he did. See more of Envelope at FredArt:
'envelope' - Kasumi
envelope(e) - Nanase Kasumi
envelope(e) cover art
Kasumi & Misato