I actually drew that dude with MARKERS. Only the slightest bit of digital editing touched him (messin' with the color/brightness levels to keep him from looking like a static-afflicted 60's color TV image).
The background and stuff, however... yeah, that was all computer-done, cuz I'm a lazy bum. And I don't know how to color large areas smoothly with marker. :/ I'm still learning.
Other'n that, whaddaya think? (I know the spire kinda sucks. Same with the background. Like I said, I'm still learning, and that includes GIMP and Corel Painter Essentials.)
Also... the title. I just thought it sounded kinda cool, and captured the feeling of fleeting, sneaking darkness. He's not really a thief. Come to think of it, I'm not quite sure what he is. He might be a rooftop killer. Maybe he's a florist. I dunno.