It’s kind of hard to tell for this image, I think the background is probably real, or at least, created separately. but there are a couple sus features in the foreground. Superman’s right hand, the green jacket, and the apparent facial features of children I mentioned before.

It does have a signature in the bottom right, so I guess you could track down the artist to find out for sure, but with my first comment, I was just pointing out the comedy of kids with facial hair.