Comet Kicker is my character in a Fallout: Equestria tabletop game. The descendant of a long line of Kickers and loyal soldier of the Pegasus Enclave, Comet Kicker got unfortunately stranded upon the surface when a military operation went FUBAR. Now she's stuck with a bunch of surface ponies, trying to complete her original mission while sowing collateral good along the way (Collateral is the right word, because Comet is an explosives specialist). Essentially a Dashite who nopony's got around to branding.
There are a few possible reads of the piece; the exact composition was up to the artist's discretion. My favoured reading is that Comet climbed to the maximum altitude she could endure and paused in wonder as the sun rose over the horizon. Her descent will start soon, and when it does she'll leave a white-comet contrail through the entire sky on her path to strike the earth.
Another read, suggested by a friend, is Comet looking at a town blow up on the horizon and thinking "Whoops."