Black and grey tattoo design of the classic Harley Quinn, wearing her original jester costume from the Batman animated series, complete with her iconic black mask. The design should focus on her playful and mischievous expression, with detailed shading on her black and red jester outfit and mask. Incorporate her oversized mallet or playing cards (hearts, diamonds) in the background. Use strong contrasts and fine linework to highlight her retro, comic book style with a realistic touch, emphasizing the mask as a key element..