Try painting some Khaki/Tan in a very thin line between the green and dark grey/black
Another for this. BAsically, effective real camo jobs make minis look blah, because they break up the image. Having things a little highlighted helps IMOH. LIkewise, metallics on joints, heat sink grilles or weapon barrels are unrealistic, but help the mini pop more to the eye.
You'd never see an Abrams with yellow hazard stripes, but you'd be suprised how much a few accents can add to the appearance of a mini.,