Hey Phil. I actually find all your other video very instructive. Thanks again for sharing. I am consider myself an intermediate level photographer but I never did anything like portrait so this was a great lesson for me to explore my capability.
I followed your instruction and this is the result I got. All was done on manual settings on the flash.
Canon T2i (550D)- Tamron 17-50 F2.8 Non-VC, Sigma 70-200mm F2.8 EX DG OS HSM, Canon EF-S 55-250mm F4.5-F5.6http://www.astronomyphotography.com