It works. Nice job.
Agreed! David, would you mind sharing a few of the key steps to get that look?
The building itself is really spot-on for the style. However, I think if I was playing with it I might have masked out the sky and replaced it with a noisier gradient of the same colors (along these lines)
Thanks! Interesting thought about the sky. Definitely could have gone in several directions with it, but I chose to keep it clean/smooth to counter/offset the heavy textures of the building - didn't want texture-overload.
Regarding the workflow, within Photoshop I make a lot of passes with the ACR filter using the radial filter to create pools of light and to bring in clarity with dehaze (I don't use clarity much). Tonal Contrast in Color Efex and High Pass sharpening bring out the texture. Selective Color and HSL adjustment layers to bring out some colors and suppress or shift others. The image was too bright for me - I wanted that dusk/twilight feel, so Topaz Restyle was used to simulate that. Various Dodge and Burn layers. Finally, to get the hand-drawn sketchy look I used the AKVIS "Sketch" plugin.