Descriptive Writing with a twist! Suitable for KS3 or 4

This is a lesson I taught in order to get students thinking about how to write more descriptively and in a fun way. It involves them writing a 'pirate' story by using a 6x6 grid which gives them images as a stimulus for each sentence. They will need dice for this activity. After they have done this, they then think about techniques to improve their writing further (extract from 'Treasure Island' provided for students to get some ideas). They then create an up-levelled and improved version of the grid and challenge each other to improve their descriptions.
Any feedback welcome!