It's always the best group shot where someone blinked. You can't restage the wedding toast, and pasting eyes from another frame takes ages and rarely looks right. This fixes the eyes on the photo you already have.
Upload the photo — Open closed eyes is already ticked. Google's Nano Banana 2 finds closed and half-closed eyes and paints them open, rebuilt for that person: their eyelid fold, lashes, iris color, eye size and spacing, with catchlights that match the light in the shot. The eyes look where the head is turned, and eyes that are already open are left alone.
On a group photo it opens the eyes of everyone who blinked. To fix just one person, name them in the note: "the man in the blue shirt". You can tick other fixes in the same run — clear skin, whiter teeth or a smile. The framing, background and colors stay as they were.