What an amazing diversity!
No matter where you travel it is normal courtesy to ask permission before you take photographs of people. In some countries it is easier than in others. In Morocco it is very difficult to get permission to take a photo of people you meet. An exception is the children and they want money for it, cant say I blame them! In many other African countries the children love to be photographed particularly if they can see themselves on the screen afterwards. The same applies to adults and with digital cameras its so easy and a great way to get in contact with people.
In Myanmar most people where only positive to be taken a photo of. That applied to normal people on the street, children and monks. Amish people in USA do not want their photo taken and it is important to respect that. But some times I feel that I am too careful. I feel awkward and find it difficult to go up and ask someone; Can I take your photo?When I dare to do it and get a positive answer I often work in such a hurry hat I risk the photo to get really bad. So I have to work with this matter! But in spite of this it has been some nice photos of people during the years we have travelled.