I have aksed to take some shots of portrait picture by bracketing. I hv never used SLR camera before in my life and i hv to use now for my this elctive subject. What is portrait actually? What sorts of things i have to keep in my mind while taking shots, i hv to take picture of standing person. What portrait picture should focus? what should be the distance between subject and spot? I would be glad if u kindly provide me some information regarding portait.