My only critique is that the red text feels wrong. The color is distracting and the font is too basic to fit alongside the main title in gold.

As another comment said, he’s too big. I also saw your answer, and agree that some size difference is hot, but he’s too big to be realistic, and too small to read as a purposful artistic choice. Making him bigger would create a comic effect, so I’d say to bring him down a bit.

The second thing I don’t like is the difference in artstyle between the two. The sub is white and gets multiple shades of grey, but the dom is black and flat. If you get the texture right, you can lighten the leather, having it reflect some light, and still have it very much read as black leather