The job in a critical analysis is to summarize, evaluate and respond. Your reader won't understand your evaluation and response unless you first explain what you are talking about. Therefore, the first part of your paper should be to summarize the communication project and explain what it was all about. You might need to talk about the people involved, the content, and the experience as a whole. Next, you will analyze and evaluate. To do that, you will need to think about what would have made an excellent communication project and then compare the one you are analyzing with this "ideal" project. Generally, a critical analysis will compare different aspects of something. You will have to decide what parts you want to evaluate, but here are some possiblities that occur to me:
How clear the presentation was.
Whether the right focus was chosen.
Was it interesting?
Was everything covered thoroughly?
Was the information unique, or did it tell things you already knew?
The final part of a critical analysis is the response. This part is a personal reaction to the project and tells whether you liked it or not and why. It also might talk about how this project reminded you of something else you had heard about, read, or experienced. A response makes an excellent conclusion to your essay. However, some instructors do not want your critical analysis to include a personal response, so you might want to check the instructions or ask your professor about including that aspect of the paper.