Many, many things. Generally you will only run into a problem with two-dimensional art, where a photograph can be a pretty accurate copy.
As a Boy Scout trying to get photography merit badge, Steven asked permission to do a film instead of take photos. He got permission, made an eight minute western, and got his merit badge.
No, you will need the other parents and the courts permission.
If the final divorce decree stipulates joint legal custody, neither parent can take the children out of state without the others permission.
No, as both signatures are required on the passport.
Not in the United States unless you get emancipated
If the photo is taken from a public space - yes
No. Unless it is being used for a purpose that affects the neighbor.
Probably not unless they have a copyright on the photos.
Absolutely not! Taking anything from anywhere without permission is theft. DeviantART doesn't make anything different.
They can not print this picture without permission.
No. However, if they are on your property without permission when they take the picture, that could be considered trespassing.
It depends on where they are and what you do with the photos. If they are in public and you don't use the photos for commercial purpose, it is legal. However, there are issues if the person is in their home and you are "peeping" or if you intend to use the photos commercially.
Without permission it is illegal but if they ask you to then it's legal because you have their consent.
no
Legally, in most cases, yes. Ethically, no, not without permission.
Techincally, he looked at some other scientist's photos (without permission), and he interpreted them.
You cannot view another person's photos that are located on their phone without their permission.