It was pretty fun drawing the Gotham Sirens. It actually was just supposed to be Harley Quinn just by herself making this pose, but I thought it looked a bit too empty. So I added Poison Ivy giving Harley some bunny ears. I've always held back from drawing Ivy because I'm still trying to find my own unique design for her. Still working on it, so this will do for now
After drawing Ivy, there was just an empty space to the right of of the drawing and it just made sense just to put Catwoman in there to complete the group.