Absolutely stunning work
A little tip I used many years ago for paint chipping, I used a little amount of Vaseline on a brush and dabbed it where I wanted the effect of chipping,
then I would spay or airbrush the paint all over as needed for the model,
when the paint was dry I would gently remove the paint over the Vaseline then gently wipe it away leaving flaky edges, the more top coats of paint added over the Vaseline the deeper the chipped paint looks