Hello, hello...
This one son finished. The first pic describes the exhausts stains painting process. Captions in french, but more or less, it says. Highly diluated white and dark tones (95% of alcohol) to draw them with the an airbrush), then oil washes and pencils job for the finish and the small dirt/scratches. The other areas are not yet weathered. The last two pics are just showing the airframe withe it's airbrushed markings over the Midstone/Dark Earth camo...
For the Fishtails themselves, brown layer, then pencils lead (black, brown, orange), + washes + white shades on the last two, and, at least, washes.
If you are interested, the full step by step process of the previous stages is available.
Thanks for looking at !
Anis.