If you want to try out any of the techniques he uses, here's a rundown of his regular staple of apps:. 645 PRO MK II, $3.99 - "It has a built-in light meter and does manual settings like a DSLR." (Camera FV-5 offers something a bit like this on Android.). Slow Shutter Cam, $0.99 - "It keeps the shutter open for blurred motion.
Engadget , A guide to street photography: Gavin Harrison's smartphone art, A guide to street photography: Gavin Harrison's smartphone art