what should we write in picture discription?

The picture description tests your imaginative faculty, vocabulary, ease with language and your critical abilities. So, for answering this question, look at the picture carefully and analyse it for a while. Start describing the picture. Use 'position' telling phrases like 'on the left', 'in the background', etc. to state the precise location of objects in the picture. You can make assumptions about the places and situations. Insert your own opinion about the situation portrayed in  the picture. Use your imagination to the fullest in order to write a precise, well-informed and logical description of the picture.