In the Photos app, you can make stickers from the subjects in your photos and animated stickers from the subjects in your Live Photos. Then use your stickers to decorate messages, photos, notes, and more.
You can turn the main subject of a photo into a sticker.
Go to the Photos app on your iPhone.
Tap a Live Photo to open it in full screen.
Touch and hold the subject of the Live Photo, slide it up until you see a duplicate image of the subject, then release it.
Tap Add Sticker.
The animated sticker appears in your stickers menu, which you can access when you use the iPhone onscreen keyboard or Markup tools.
Tap Add Effect if you want to apply a visual effect such as Outline, Comic, or Puffy.
Go to the Photos app Send stickers in Messages on iPhone