crsze

Hi, I have been trying to produce an image to use for some of my business marketing, something similar to this I have followed a couple of the tutorials on here, utilising the drop shadow and alpha mask. The thing I would like help with is the lighting and colouring. I have managed to do something in black and white, but I am unsure how to do the lighting effect or colour certain areas without it looking, well to be honest cr@p! This is what i've done so far, Can someone provide me with some advice on how to get the effects please.