I love it! Do they do plastic surgery in MLP universe? The cleavage is more Catwoman/Selena's thing not Harley's nor Pinkie's. This is a great picture just too sexualized for me but I get that it's your preferred style of art. It's a skin tight suit so showing that much cleavage just feels like overkill to me.

I'm totally going to use this(and numerous other images of Harley and Pinkie, from crossover versions of each other and separate) for inspiration to design a cosplay version.

Cotton candy pink afro curls styled into pigtails(Which is actually easier done than said.), cutie mark balloon colors instead of white colored puff balls on the collar, pink and grey or dark and light pink instead of black and pink suit colors(similar to Harley's V-Day costume), balloons anywhere Harley has diamonds, collar and cuffs will sparkle with either white or holo glitter, silver colored brass knuckles with bells replacing the spikes, confetti cannon as the mallet and/or an air bazooka with confetti in it, clown makeup in Pinkie fashion, domino mask covered in shiny confetti, light pink almost white mask, mardi gras/pinkie style mask, bandana that has a smile on it to cover half of her face, and maybe I'll also design her superhero outfit into a Harley Quinn version and put it on Harley.....yeah there's a lot I could do if I ever have the money and finish my other cosplays. Especially my Alice Angel and Phoenix Elsa. At least this comment will be notes in case I forget or lose them.