Posterior(Butt) Modeling?


I was wondering if there are any good tutorials for modeling a butt? I’m not very good at this part of character modeling, when I try searching for tutorials or tips, all I get are pinterest archives of just 3d modeled backsides. And that doesn’t help me learn how to do it.

Also, this is out of inquiry of what I’m doing at the moment…Any clue as how I should proceed?
Every time I do “complete” the waist portion, the waist/crotch area on the underside leading back into the butt just looks like a diaper, and I revert back to this.

So…After surfing I figured some things out…And came up with this…I think I can work with it going forward…