I have noticed I am often using some variation of "____ is not too monstrous/scarry/vile" comes across jokingly but they get that little validation and really have no clue if you like or hate it, its just the way it is and thats nothing to you...

Trying to sort out the real underpinnings and it has elements of push pull, also seems like I am jumping through their hoops tho, never compliment a girl physically and all that but in a sense your giving a compliance test ok lets see, then throw it in and "rewarding" them with something that doesn't get a negative reaction, tho often times it opens the door to X body part very easily they jump at the chance to change that "not too scary" to omg nom nom nom...

Mostly tested for online game, but used many many times in RL as long as your half joking and dont sound disgusted goes over well.

Opinions, input all welcome, if you bash it leave a justified reason. Always looking to learn.

Its very difficult to advise about push/pull, teasing and negging. This is because every situation is different and its always a judgment call that you should be making based on your own instincts and experience rather that what you've read on the internet. You might read about a guy who got laid by being quite rude and try and same lines and get slapped in the face. I personally wouldn't recommend making comments about a girls appearence being "not that monstrous" if thats what you mean. Here are a few rules of thumb.

-You don't need to neg at all to get laid.
-Only neg girls that are confident and regard themselves as good looking. Basically girls that give the impression that they think they are better than you and need taking down a level.
-Once a girl is comfortable with you, i.e. she is over the initial stage of being scared because she is talking to a stranger, then light hearted teasing is the way forward.
-There's nothing wrong with giving a girl compliments. You just need not to appear letchy and or slimey.

Hope this helps