Think of these things when describing a picture
1. Who/what is in the picture? (the picture shows, there is, there are)
2. Where in the pictures are the objects? (left, right, middle)
3. What are the people doing? What are they wearing? (The man is ... -ing, she is wearing ...)
4. How are they feeling? (She is smiling because.., he is angry because.., she must be happy...)