There can be no blue sky on Mars - this is another NASA fake (google translated from Russian) "Due to the highly rarefied atmosphere, the sky on Mars should appear black. However, NASA shows terrestrial atmospheric haze and an overly bright, blue sky"
(tynffzsa7jac2fn7kyjm3yccpm-ac4c6men2g7xr2a-zen-yandex-ru.translate.goog)
Aren't these false color images - taken with cameras in wavelengths that we can't see, which then have colors added so we can see details better?
Also, NASA has released a ton of images that show the sky being every color from red, to near-black, to yellow, to blue, and in some cases, even green.
https://nypost.com/wp-content/uploads/sites/2/2020/07/mars-4.jpg?quality=90&strip=all&w=1286
https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Fassets.newatlas.com%2Fdims4%2Fdefault%2F972d675%2F2147483647%2Fstrip%2Ftrue%2Fcrop%2F999x666%2B21%2B0%2Fresize%2F1200x800!%2Fquality%2F90%2F%3Furl%3Dhttp%3A%252F%252Fnewatlas-brightspot.s3.amazonaws.com%252Farchive%252Fmars-challenge-in-situ-1.jpg&f=1&nofb=1