Or how to cut paper dolls. Your goal is build precision and completeness into their writing with this assignment. Stress order and clarity first. Encourage them then to think about interesting words after they have written a logical sequence by using words such as first, then and next. By 6th grade, many writers will add more details, but don't be discouraged when they make omissions.
Older students become increasingly precise and use adjectives more fluently.
Again, try letting them follow their own instructions by way of editing. Many 4th graders will be able to state an opinion and give reasons supporting their reasons, and indicate when each new reason begins separate paragraphs. Some will not. Ask God to show you how to draw thoughtful opinions out of your children, giving them confidence that first God is interested in their thoughts and you are, too. Help your child to understand how to develop reasons why they believe what they believe.