I like this model a lot, and the sculpting's great. Unfortunately, you seem to have done what I've seen a lot of other people do when painting flames. To my eyes at least, the colours are the wrong way round. White is the hottest colour and red is the coolest, so it appears the flames are getting hotter the further they are from the engines. Maybe I'm just being really pedantic and you found it looked better this way, but that's the one thing I would change.