1. Use Data: Base your feedback on concrete data rather than personal opinions. For instance, "Our open rate increased by 15% when we used a personalized subject line." 2. Be Specific: Point out exactly what needs improvement and why. For example, "The CTA button color blends with the background. A more contrasting color might improve click-through rates." 3. Positive and Negative Balance: Start with what worked well before moving on to areas that need improvement. This helps in maintaining a balanced perspective. 4. Follow-Up: After giving feedback, follow up to see if the suggested changes have been implemented and if they have led to improvements.