Dyes play a huge role, but it boils down to relevance.
Dark vs. light is probably the first thing that becomes relevant for us, as the difference is [literally] like night and day; then hot colours (red, etc.) because of fruits and blood. Then the rest.
I didn't dig too much into Homer's usage of "bronze sky" (unlike the wine-faced = inebriating sea), but if I had to take a guess, he wasn't referring to the colour but calling it "glorious", or perhaps a "noble" sky.