To share contact pictures, you typically use your phone's built-in Contact settings to enable "Name & Photo Sharing" (iPhone) or "Profile Card & Picture" (Android) to automatically share with contacts, or you can manually share individual pictures from your Gallery/Photos app via messaging apps or links, depending on your device and the recipient's app.
Go to the Contacts app on your iPhone. Tap My Card at the top, tap Edit, then tap your contact photo. Turn on Name & Photo Sharing to start sharing your contact photo and poster with others.
While the photos are chosen at random, you do have some say into which photos to make available for a feature, so you can highlight some of your favorites and avoid embarrassment in the process.
Open a photo of the person or pet that you want to add. Tap the Info button , tap the face of the person or pet with a question mark, then tap Edit Name and Photos.
If you have an iPhone, iPad, or Mac, your Apple Account photo also appears in the Settings app (on your iPhone or iPad) and in the System Settings app (on your Mac). If you're part of a Family Sharing group, others in the family can see your Apple Account photo in their list of family members.
Tap the photo or video whose metadata you want to see, then swipe up or tap . Depending on the photo or video, you see the following details: People and pets identified in the photo (see Find and name people and pets) ...
This is expected behavior for iOS 17. Contact Posters are set by the user and display at their discretion when either calling or being called. There is not an option on your end to change this.
It means the contact updated their contact photo - So if you have them saved as a contact on your phone, their new contact photo will be displayed when they call/text (if you accept).
Three-finger gestures on iPhone primarily activate accessibility features like VoiceOver (for screen reading and navigation) and Zoom (magnification), allowing scrolling, zooming, and text manipulation (copy/paste/undo) with specific taps and drags, though some text actions work without VoiceOver enabled for quick editing. Common gestures include three-finger double-tap to toggle VoiceOver speech, triple-tap for the screen curtain, and pinching/spreading with three fingers for copy/paste actions, notes this YouTube video.