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Love the scheme as a whole. Personally, I'd keep the metals as you have them, tidy them up, then treat the ends of the engines as people treat flamer nozzles. Show the heat effects on them with a yellow/blue/brown wash (Brown at the end, blue in the middle, and yellow forward) if you can in the space available.
However, that may also be a bit advanced. The main thing that struck me from your pictures is that you haven't pulled the joins in and you haven't filled them. This is most noticable at the main cabin joins, and to a lesser extent at the joins in the engine halves.
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