Take a look at Amnesty International letter writing kit pdf. It will help you write your letter. Focus on p 12 downwards. There is also a doc where you can print your letter template from.
Amnesty International letter writing kit.PDF
Amnesty International letter writing kit.doc
This is a padlet to share your letters to Amnesty International and the pics of your working on them.
Don't forget to include your name and country in your posts.
https://padlet.com/IOANNALAM/g423em0l84xdxid0