very nice but you have two conflicting styles here. The shading on the body is more on the realism side while the suits or costumes have a cartoon style.
Other than that, I think you did a good job at this. :)

Nice thumbnail to draw in folks lol, was not expecting this. There's an interesting blend of vector, flat color, and realism, from catwoman's face to her outfit, to Batman. This piece has a lot of character to it, but I would recommend developing the anatomy of catwoman's ches area. Maybe cave it in a bit, develop the sternum and collar bone structure to shape out the neck and make the breasts pop out more. You did a great job on the face, and would just like to see a bit of a touch up on anatomy and wrinkles in clothes. You have the skills, so I think this might of been just a quick sketch. Great job, overall!

i hate the hole selfie trend but this art is great

The coloring is a bit off in a lot of the areas but if you look past that it's all good. I actually liked that art contest