Luciano! Thanks, I'm glad to be able to offer some inspiration!
Damian! Whenever I post something on sticks I think of you

! I'll leave the antlers off until last minute, they're fragile...
Joel! Exhaust stains aren't my favourite either. I have always used my airbrush for them earlier but apart from the risk of ruining an almost finished model, the stains turned out far too monochrome for my taste. OK, could be fixed by adding further layers but I still found it difficult to control. This time I used dry pastels, see photo below!
Russell! Thanks!

Exhaust-staining-equipment! Pastels can be found in art stores, I have several different brands and they are all good. Some come in sets while others come "pick and mix". They aren't expensive and will last for ages! Be careful so that you get dry pastels and not oil pastels, they are smeary and I haven't (yet) found any modelling use for them

! The pot of pigments is MiG's "Black Smoke", I have found that they "bite" better inte the surface than the ground pastels, that's not always desirable though. I use an old paint brush (save your sable brushes for paint, the sand paper will kill them quickly!) to apply the pigments, the cotton swab comes in handy for adjusting and cleaning up the effects

Finishing touches... Most of the stuff in place, working on the weathering!
Magnus