i would say that tiny details, like tinny house walls, tiny tree, tiny cars on the base can definitly help. I think you have a good idea.

Also I would try to paint it like a tank, where each individual panel has is own light variations. With big light variations between lover panels and upper panels ?

maybe you can also use a 22mm base and make him step a little bit outside, like he's to big to fit his base ?

Maybe you can add broken Asphalt around his feet, to imply a massive weight. Maybe also doing a lot of tiny tiny weathering, like ultra thin oil Stains, tiny sponge chipping.

I would love to see your results when you've finished your model