1st video-
The model's neck was stretched slightly up and her eyes were made lower and bigger. A little more shadows were added around the outline of her face as well.
2nd video-
The model's legs were made slimmer and longer, her neck became slightly longer too. Her shoulder was lifted a little bit and highlights were thrown everywhere.
3rd video-
The girl's body was shrunk down by quite a bit to make her slimmer, then her head became a little smaller to match the new body size. Her hair was made longer and more crazy.
Questions-
4. In news stories and big events people don't use Photoshop to change those photos drastically before putting them on the news. That wouldn't be ethically acceptable, so I don't think changing someones appearance and putting it on ads everywhere is either.
5. I think during ads for beauty products like makeup is one of the times when it's even worse to change someone's appearance. When you see a commercial for makeup you want to see what it actually looks like on a normal person, not what it looks like on the face of a nonexistent woman with unreachable beauty.
6. Some changes are acceptable, maybe there is a person who wants to use a girl for a ad or something. She has the exact shape they are looking for but she has a birthmark on her upper stomach. There is an acceptable time for Photoshop, however, it isn't so good when they change her skin tone, and make her legs longer,etc.
7. Fashion photography is a more persuasive use of the camera and requires a lot less camera and more computer, photojournalism can still be used for persuasion to go somewhere and such but it is also used for things like the newspaper and is mostly camera not computer.
8. Fashion photography shows very little truth or reality. It's used mostly for ads that just want you to buy the product. Photojournalism can be similar in ads advertising for a place but that isn't all it is.
9. I think you are showing us these videos so we can see other parts of photography and possibly get frustrated enough with it to try to do something about it.
10. The videos most likely don't have guys because the perfect physical appearance for most boys is easier to get too than the perfect physical appearance for most girls. Also with marketing more beauty products are for woman than for men so more woman are used for ads like that.