Gilda has always been one of my favorite MLP FiM "villains" and this makes me like her even more. I think they should bring her back like Allsmiles88311 said. Nice job with the pencil darkness, by the way. The emotion this gives is amazing.
... Gilda was a class-a jerk, a bully, and kinda possessive in the episode she appeared in... But I wouldn't mind seeing her back to patch things up with Dash. Learn a life lesson, move on... in a series that features forgiveness, I wouldn't mind seeing them get to be friends again... She just needs to get her head on straight.