Be specific about what worked
Instead of only saying that a picture is lovely, explain what it brings back for you. Perhaps a small gesture feels familiar, the setting adds context or the sequence captures the mood of the day. Specific observations tell a photographer more about what mattered.
Separate feeling from requests
When asking for a change, name the image and describe what you want to understand or adjust. A clear, focused request is easier to discuss than a general reaction to the whole gallery. Give yourself time to look through the work before sending a list.
Share thoughtfully
Before posting a review or sharing an image publicly, consider the people shown and the context in which it was made. Credit the photographer where appropriate and ask before including private correspondence. A kind, accurate account is more useful than exaggerated praise.