One example of a good sample format for critique articles on someone's writing is to first summarize what the text was about and then provide positive feedback. The last section of a critique should provide specific suggestions on how the author can my improvements to the writing piece.
It is important to summarize the information or main points of the writing piece to demonstrate one's understanding of the content. This helps the author learn about how well his or her points were communicated. Providing examples of what worked well in the writing can help a author deal with later criticism. Criticism should be respectful and helpful for the author on how the work can be edited and enhanced.