Include the subject of each class you are analyzing and your observations. Papers like these should be written as if you were in the cafeteria and were talking to some friends about what youve observed in your classes. Models are just that they dont typically reflect the reality of being a student in a particular course. Try to give more examples from behavior (of students professors) that you have observed during classes. Its also OK to explain how a class feels to you and to others. Is it fun interesting boring tedious great horrible etc. and WHY would be a good way to approach your critique.