Help with rendering a fire

vigge50

Hello
For a long time ago I was testing Vray and at that time I learn through a guide how to do a nice fireplace put now even if I try to use the same guide I can't get it right, does someone here know how to do a fire that's light up in the right color without using photoshop?

I am quite sure that I was using this guide but I never use photoshop or other program to edit the picture.

http://www.sketchupartists.org/tutorials/sketchup-and-v-ray/lighting-with-v-ray-for-sketchup-definitive-guide-part-2/