Nice looking SU-85 you have there. Russian green looks dead-on, esp the photos taken in the natural light. Decals look good too, as most Russian markings were plain. I would drybrush some steel on the tracks were they contact the ground, and dont forget the guide teeth. One last thing, give that engine grille a wash of black, followed by a drybrush of your green (lightened). This will make the kit grille look more like a screen then a solid piece.
Other then that, you have a fine looking SU-85 !!
Cheers !
Alpen