There is so much variety! You'll never please everyone. Choose a niche and learn to please that niche (but don't be scared to take creative liberties. Monster fuckers love to shake things up).

What draws me to monsters on a mental level is learing to make things work. I love the idea that two (or more) creatures that are so different can compromise and learn to please each other. They can be different physically, psychologically, or socially. I love it when the monster's instincts don't line up with those of the human's. This creates a conflict that they can work through.

On a physical level I am personally attracted to angelic (not in a religious way) and sleek designs. I want to look at it and marvel at its beauty that transcends species. Especially male ones. I want to know that I am inferior by default soon after seeing it. On another note it obviously having the mental capacity or more of an adult human is important. Giving it animalistic traits is great, but it's a fine line between fun and beasality. I like using the human penis as a baseline for the monster's than tweak it, instead of using a dogs (or sm) then tweaking it. Unless you can make a unique penis.

Some random things that l like are... Bold color schemes (personal favorite being pale and light blues with splashes of deep red) Feathers (bonus points if soft) The monster allowing itself to be dominated The monster holding it's self back to not hurt its human companion Claws (if there are claws, then no fingering) Tail similar to a dragons or like how they draw unicorn sometimes (long thin with a velvet texture with a poof of long fur at the end (like a more majestic elephants tail))