The anime mouth in the green woman is shaped like that to show assertiveness of her position.
The tumblr post does not, is more whiney, and snide.
The eyes on the red anime chick shows more frustration than the tumblr one. The anime one is clearly pouting.
The animes breasts, while somewhat flattened, is being drawn that way to show how further out they are in her chest and also shows how arched her back is. Which lines up with the overall assertive stance she is making.
The tumbler one has no sense of nuance and the noses are retarded.