denn333 suggests they award the prize to the AA gymnast with the highest E scores from the AA competition. I’d go for that.
Who picked the photo for their website?
… In association with the International Federation of Gymnastics (FIG), Longines awards the Longines Prize for Elegance at each Artistic and Rhythmic Gymnastics World Championships. Prize-winners receive a trophy, a cheque and a Longines watch. …
Gymnastics Coaching.com 