hey there,
Love the look of him from the back, and I love the mix of cold to hot colours on the model, that always makes that sort of hot yellow flame stand out imho. The thing I believe you\'ll see with many really really good osl jobs is the slow fade of the light from the point of origin. You have the right idea with only the panels facing the flame \'lit up\', but it has to get less strong the further away you get from the source. The chest piece is a good example - it is just as \'lit up; on our left (the models right, away from the flamer) as it does on the side nearer the flame gun.
The real trick to awesome OSL I believe is to paint the model totally as per normal first and then add it in afterwards, so the pigment interacts with the surface it is on (being mostly translucent). sweet try at it though!