I've been trying to get a decent portrait of Dozer lately and finally decided to take one of my studio flashes outside and shoot him with an umbrella. It was an overcast day. I metered the ambient light with a Sekonic L-358, and then set the flash power close to the same reading.
Canon 5 D
70-200 2.8 Non IS
Novatron M-600 Digital Studio Light
Sekonic L-358 Light Meter
Exposure 1/125th @ f4