Lighting troubles

I have a green screen subject that i want to pu in a scene. The original scene is strongle lit on teh left by a blue light and strongly lit from the right by a orangey light. There is another subject in teh ariinal scen that has tehse lights already affecting them. What is the best way in shake 3.5 to add these 2 contrasting light sources?

Hey,

you can try this to get some volume :
use emboss filter, some CC and IAdd or IMult on your subject.