@bno buy a range of cheap make up brushes. Buy a few rattle cans with colour primer, two dropper bottles of paint of a lighter tone for each primer can, a brown wash (agrax earthshade or similar) and a few neutral tones like brown, mid grey and black, and skin colour.
Prime the models. Watch a video or 3 about dry brushing, then dry brush the lighter tones on. Pick out leather in brown, some details in grey, skin with skin, hit that that shit with brown wash.
Quick results in hours