Hi Seb!
Good looking BTR you have there! The jacket and the furr cap are realy realistic touches! I like you rendition of the mud also.
My onlu nit-pick would be the decal. It seems that it hadn't settled properly, at least in the firs picture. Recently I used Humbrol DecalFix for the first time and Im quite happy with how it works. Others can probably give you info on array of decal setting products from other manufacturers
PE you used gives it nice in-scale details. Only for me using PE is too time and cost consuming so I tend to do this when I realy must, or even scratch needed detail instead.
The figure I used for my BTR comes from ICM set # 35281: Soviet Tank Crew 1979-1988. there are four nice figures in the box.
As for my rust, it was simply painted on with a fine brush. I used a diluted acrylic Citadel paint 'bestial brown', however any rusty colour would do the job. Most of similar rust efects can be done via pin washes instead. Probably its faster and just as effective method.
Cheers
Pedro