These worksheets are designed to be used as bell work or for centers. They are great for getting students to carefully note important details. The attraction for students is the chance to be artistic. Of course, they are also learning a valuable skill.
Note students are encouraged to use highlighters as they read the text. This gives the instructor insight into their abilities and thought processes.
If used for bell work, I always take the opportunity to share student work with the rest of the class and emphasize attention to relevant details. I rarely discuss the student's artistic skills, as the focus is academic.