Comping techniques for background ?

Hi

I have a shot where there is a person facing camera. Its a medium shot. Behind the person are bars and behind the bars is the green-screen. I’m replacing the green-screen with a camera projection of a fancy hallway with chandeliers etc. The depth of field is pretty shallow so the background will be out of focus. Heres a pic I found that illustrates the general idea.

http://i.zdnet.com/blogs/success-through-bars.jpg

The background is going to be very moody so I’m looking for some techniques to sweeten the shot. For example, should the illuminated chandeliers have some glow to them that wraps around the foreground figures? Should there be some camera flare? How would this be achieved on what is essentially a tracked in still image?

Im fairly new to nuke and compositing so any ideas and a quick approach to achieving them would be super helpful.

Thanks!!

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