Yes. Each letter is unique, and yours should be too. We recommend going with a simple letter if this is your first trip.
You can find examples of trip letters, trip letter templates and photos from the previous year to include in your letter if you wish.
Photos in your trip letters add a quick connection to what you will be doing on your missions trip, but they are not necessary. People give because God has tapped them to give. Your letter just invites them to listen for God’s tap on their heart.