This is a hand-illustrated digital portrait built from their race photo — swimmer, cyclist, or runner, rendered in a clean editorial style and printed on heavyweight fine art paper. There is nothing generic about it: it is their face, their race, their kit.
For an Ironman finisher, it's the kind of gift that makes them stop talking when they open it. The artist works from the photo you supply, and ships within two weeks.
"Order it after their race while the moment is still fresh. Present it framed or rolled in a tube with a card that says 'I wanted you to have a picture that actually shows what you did.' Give them a moment to take it in."