Here is a list of all of the creators. (2 images belong to her) (The cosplay belongs to him. He is the damned creator of the character.) (2 images belong to them) (1 Image) (1 image)
You can just reverse google image search to find the creators. If you don't know how to do that then it is still not an excuse because you literally can just search "Laughing Jack" here on deviantart and you shall find the creator to every piece used here.
This is considered art theft. Posting artwork that does not belong to you without direct consent of the creator is against deviant art policy.
I highly suggest taking this piece down or risk being reported.