
When You open Your photo in Photoshop make first step: Image -> Adjustments -> Desaturate (Shift + Ctrl + U). That will be our base image (I'll resize it to 450x600 px for presentation - You may work with larger image if You want or just use this bellow if You don't want to register on sxc.hu).
Now we will add a Adjustment Layer called Levels. Hold Alt Key, and click on Adjustments Layer button on Layers Palette. Select Levels. Make Sure that Use Previous Layer to Create Clipping Mask is sellected. Then just slide dark arrow a little right.
As You can see - image is a little darker now. Now we will draw some fire. Make New Layer, ...