We are a charity organization trying to overcome children's death from hunger and poverty in Africa, Tanzania. Children in school which we are helping would love to send a postcard to you ;) It would be cool if you also send a postcard to them ;) It's like a postcard culture exchange.
Please try to use easy English so they're happy to understand your card without our help :)
You can write about whatever you want, but I think they would be particularly glad to know of the popular hobbies and traditions of the place you're from, and they're also interested in sports and pets.
About the picture, a regular landscape/city postcard would be perfect since we put them on a giant world map.
Also, if you have a question about Tanzania or something that you want to check is true feel free to ask! They will be proud to be asked about something: they're young and have no perspective so they tend to think nobody's interested in Tanzania. I will give you the answer on the email or Instagram, and your question may well entail a heated debate in the classroom to agree on a common answer ;) so that'd be interesting.