One where you're squatting, like the Broly Culo meme or smtn An attempt at the Jacko Pose (you know, the one where it looks like someones back is gonna break at any moment) and of course, taking a picture of this booru and using the pose as reference
Squatting, facing away from the cam, ass sticking out towards the cam, your head turned right or left to look back at the cam, making a blowjob face with one hand making a blowjob gesture in front of your mouth, a peace sign with the other hand
I gotta suggest the classic. Face down, ass up, hands spreading your cheeks to show off that hole. A pose that always screams "Rail me senseless" to me.