I wanted to figure out some other words to get somewhere in between, so I used a prompt that generated a good 3/4 portrait of a woman and then used prompt search/replaces in Automatic111 (prompt s/r under x/y plot under dynamic prompts) to do 48 different body types.

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Following along the logic set in those two write-ups, I'd suggest taking a very basic prompt of what you are looking for, but maybe include "full body portrait" near the front of the prompt. An example would be: katy perry, full body portrait, digital art by artgerm

Consistency is a general problem with generations at the moment, so I don't think there is any way to do this. I think the closest you can get is to "define" the body type using words like "Fat", "Obese", "Slim", "Thin", "Skinny" etc. in the negative or positive prompts.