We've suggested some readings from The Prentice Hall Guide for Student Writers that you may want to assign to coincide with the detail and development exercises. In addition, we've also included some other references that have useful acitivities or readings for both teachers and students.
Chapter Three in the PHG, "Observing," is particularly useful for helping students develop their essays by adding more detail and description. We suggest assigning these pages to your students. You may want to divide the reading into three sections, as we do here. For each section, we provide a summary as well as a screen you may want to download and modify for an overhead transparency. It's a good idea to provide a transparency that highlights the reading when you discuss it in class.