Point out areas for improvement and offer suggestions on how they could be better.

“avoid ambiguous statements like “the meaning in this paragraph is not clear”; instead query, do you mean this or that” Milne Publishing

Compare and contrast different views, highlight gaps in research, and check for consistency in methodology and nomenclature.

Include details like where you got the item, a summary of its features, and whether it met your expectations. Community Perspectives

Focus on the "four main elements": story, character, setting, and language. You might ask yourself if the beginning drew you in or if the character's arc felt believable.

“If you only say you liked something or didn't like something, it doesn't help the writer to know what worked for them” Pressbooks.pub