Double check -- your Live Photo Feature may be on.
With the update to the new iOS10 for iDevices, I discovered that a lot of people didn't know what a Live Photo was, nor how to enable or disable the feature on their phone.
Don't send a "not so flattering" live photo selfie.
Since a live photo captures a brief video just before and after a photo is taken. It's not uncommon to get the not so polished side of your selfie.
Do send live photo pictures of babies
Sending a live photo of a baby or toddler captures the cute reaction of getting that sought after smile to wash over the little one's face, allowing the person you are sharing the picture with to experience that as well.