What makes a fetish pic appealing? (Patreon)

And, by that, I don’t just mean “huge boobs” or something like that.  Though, if that’s really all you wanna see, I can’t fault you for that.  =p

But, I want to know what you think makes a pic sexy. What are the little details that make you think “holy shit, this is incredible” instead of just “wow, that’s hot”.

Is it a perfectly-drawn expression?
Little bits of squish bulging out of clothes?
Characters facing/talking to the viewer?
A girl struggling to move with her expanded curves?

I’m curious to know what you all think. :o