Of course you may ask, Mert!
Short answer is I wanted the five to have a slightly more "sinister" appearance, even though they were all still good guys in this timeline. Dark Phoenix was the best outfit choice for her, but I lost the TV version's black collar 'cuz it was too dark for the scene. Same for the poses and expressions for all of them, I wanted to tie in a more serious feel for the piece, while still keeping as true to the era as possible. Kinda a conglomeration of memories from the TV series in its entirety.
And that's the short answer...
PS...always liked this Archangel, too.