Well said madeinchina.
My best friend is , and has always been, very slim and athletic looking, and she has had comments since she was a teenager about this, just randomly, and often from strangers. She eats normally, just is genetically skinny, in a healthy way.
I don't think either woman in those pics is overweight, The way the second one is sitting makes her look like she is, but we are so unused to seeing non-models sitting like that, it looks like she is huge! If she stood up, she wouldn't look overweight, just curvy.
It is kind of nice to see the floppy belly in the first one, since many of us have one, and you never see "attractive" women in pics sporting one, so to have it normalised is nice.
Mine still does that when I sit down, and I haven't given birth for nearly 6 years!
But of course we are all real women, and yes, "real woman" is often used in sentences which denigrate slim women.
Be healthy, be happy with what you have, ignore the scrutiny, don't scrutinise other women.