I adjusted the contrast, brightness, saturation and shadows which caused the rust spots to really show up (and look like burn spots). I added the flame overlay, and blurred the edges a bit. I think that gave it that extra hot look! :) I also really like how the house in the background has a bit of the flame effect on it. I think this picture has a lot of story behind it after making the edits.
This picture was taken with an iphone 4, which has a 5 Megapixel camera. However, I scaled these pictures down to fit my blog, so if my calculations are correct, they are .3 megapixels.