Photo, on New event or in Edit, puts a picture on the invite. Choose a photo from your device, or one from your earlier invites under Previous photos.
JPEG, PNG, WebP, AVIF and GIF files up to 12 MB work. HEIC files don't, so if your phone saves photos that way, export the picture as JPEG first.
Once it's in, drag the photo to choose which part shows. Recenter puts it back in the middle, Change swaps it, and Remove takes it off.
The photo appears on the invite page, on the card a shared link opens as, and on the poster. Emails don't carry it.
No photo is fine. The invite leaves the space out rather than showing an empty frame, and every look holds up on type alone.