I like it!
My only (minor) critical observation is that the pigment build-up in some places, especially along the bottom edges & in some angles, looks a bit heavy & coarse.
Yes, trying to get the pigments to look like dust was a hard lesson.
On my
FSBR (my 1st &, so far, only use of pigments) I dusted on the pigments using a make-up application brush, lightly blew off the excess &, using the same brush, lightly dusted it in the direction of "fall" or "wash" then sealed it down with a light coat of dull-coat carefully misted on for the 1st coat to avoid blasting the powder off.
I actually ended up having to take off a lot using a damp brush before the dull-coat, as it was well overdone initially for what I wanted, but that initial look would have been perfect for your Mars Exploration Vehicle.