Only One Will Be Crowned

I have no idea who the artist is behind this sweatshirt design. The shopping site doesn't say.

Digital enhancement by a certain renowned cyber-sleuth (me) yielded precious few clues.

If you know who should get the credit, let me know in the comments.

And if you know who should get the crown of the King of the Wilderness, let me know that as well.

(I am very biased and cannot give an objective prediction of the bout's outcome.)