Pictures are great for writing, because they provide lots of content, but leave it up to the students to express it in words. When we wrote Pen Pictures, there were a few books of picture stories for writing available, but they were very dated, having something of a post-war flavour. And they were mainly for narrative, under-representing other forms. So Pen Pictures sets out to provide a colourful, motivating, picture based series of lessons which will develop young learners' writing skills in a balanced and sustainable way. See also the article on this topic, and the talk.