They start with their picture turned face down, and a large sheet of newsprint paper. When time limit is over, they must pass pictures to the left and do the same with the next picture, until they've written about all the pictures. Then the large sheets of paper are taped to the board or walls, and in groups students get 2 mins to check a sheet, then must move to the next. Then as a class we go over them together. If your pictures are interesting this activity works very well.
Students choose a pic on the board, and others ask questions.
When students are comfortable with the activity we expand it to include people and things not on the board. Each group has the same four pictures of people. As a warm up they must brainstorm as many adjectives as possible about each picture in a specified time. Then the teacher dictates 10-20 short sentences, which the groups write. Then as a class we check.