The fall colors in the Chicago area where I live are just now peaking. It doesn't matter if the sky is clear and blue or overcast and murky gray, the colors are really intense. I can enjoy the effect of a brilliant red maple on a rainy dark day even more. Or, the thrill of nearly black wet tree trunks that contrast with yellow and gold foliage along the roadside.
Another detail that I scanned off a much larger painting of another hibiscus flower. And this is really how brilliant the colors are that I can see from my studio window today.