can someone please add some lighting effects and shading to

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can someone please add some lighting effects and shading to this please?

I'll post a shadowless picture in the 2nd post. I would like some better shutter blind shadows casted over the Pizzaz poster (left most poster on the top right of the drawing). It has to be at that similar angle since it's like that in the cartoon. It has to be like it's appearing out of nowhere even though there's no shutter blinds anywhere.

example:
https://www.youtube.com/watch?v=fSeICCnTvWw#t=1m43s

I want the room to be dark. The girl is sleeping and she doesn't have any lights on. But there can be faint lights coming from the computer screens, the window (it's supposed to night time outside), and the blue start circle.

I want the lights to give the picture a more cozy feel.