An email.

Ohhh, my cousin!
I’m glad to see your email. Your last visit was great and I hope you’ve been fine since then.
The photos that you sent me are nice, but you are missed in them/you're missing from them. I would/I'd appreciate some photos where you’re present in them/some photos with you in them. I saw you really looking good, so I want to keep some photo from you. (No entiendo esta. Quizas puede ser I heard you're looking really good, so I'd like to have some of your photos.) Please!
Best wishes.

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Bien hecho!