Need a Third Flash?_DSC4659

SB800 on an umbrella to the right of the camera, Sigma 500 for the background. The strobes are triggered with the internal flash of my camera.

I'm starting to think that, in the end, I'll need a third flash or some kind of a reflector. At least here I feel that some source of light should be placed to the down-left of the camera so as to illuminate a bit the face of the model. Or is it O.K. as it is? Any suggestions?

Done