A picture of Daisy, the security mare, from FoE: Project Horizons.
I actually couldn't remember, if there were any descriptions of her appearance, given in the book, and i was too lazy to check, so i probably got her all wrong. But at least that's more or less, how i imagined her, while reading the fanfic.
PH is a fanfic, written by Somber.
UPD: So, i guess i completely forgot that she was an earth pony in the story, so i uploaded a fixed version of this picture.