As far as the chin goes, it fits well with the original art. Then again, the art for nearly all these characters includes a somewhat-to-very long and pointy chin. Diane either lacks a chest or hides it under her outfit, so no fault there. The outfit looks good and the hair is decent. I think the arms and legs are a little too thick and it's weird to see her legs spaced so far apart while aiming. Not only do women generally not spread their legs out like that (for obvious reasons), but it also gives the impression that her bow is too heavy to hold with standing up straight.
Nice to see her right after Zylo, but I also hope we get fan art of her sister Tao soon. Wendy would be fine, as well.