This is the one I did on my Toshiba R25 at tonight's life drawing session. A bit loose for a 45 minute study, but I feel like I ended up in a good place. It's also much more interesting than anything I could turn out with charcoal!
I really enjoy 30 second gesture drawings. I think it compliments my cartooning really well since it is really conducive to rendering quick exaggerated poses. More of that after the break.
Watch out! NSFW -- some scandalous abstracted shapes ahead! :[