#3 and the other one but shot at a slightly different angle are known as the Playboy Mag pose. It's a standard pose for all the girls in that kind of mag where no man will reject and will never go wrong to picture a girl for that kind of intention. Beside this, there are many more of these standard seductive posts. But, there are never used in normal portait posting.
Seriously, the model should avoid any bikini shoot. Her God's gifted skin and body are sadly spoiled by the tattoo. Really 看不下去!There are indeed too many of them. Unless her or the photographer's intention is of that kind. Then perhaps, of that kind of viewers will surely dun mind and love it.
Another that kind of standard pose with her feet pressing against her butt, she's not relax enough, can see from her shoulder bones that she's using too much strength to tuck her feets. If you study Glamour Photography, you would be trained better on this.
Cheers!