Emphasize the key idea.

Use motivating examples to explain the key idea.

Using the examples, also show how the proposed approach can address the problem of the research.

Criticize the paper! (Don't simply repeat it.)

1. Identify the key contributions of the paper.

• What research problem does it try to solve?
• Why is it an important problem?
• What's the proposed approach?
• How do they solve the problem?
2. Try to find if there is any problem in the paper.

• Any problems in the assumptions?
• Any technical shortcomings, problems, or errors?
• Any problems in the experiments? Do the experimental results support the original claim?
3. Can you suggest any idea for improvement?

Compared the paper to the related work.

Overall, 35-45 slides will be good. (This is not a strict requirement though.)