look up incident light readings and take these, or right off the subjects highlight.
http://www.digital-photo-secrets.co...light-and-which-type-gives-you-better-photos/
geof
There are two essential forms of light: Incident and Reflective. They work both together to create light and apart in their own separate ways. - See more at: http://www.digital-photo-secrets.co...gives-you-better-photos/#sthash.cZVBbWwP.dpuf
chump your shots and take more than one..you can throw the others away when you get the winner
cheers
geof