CUTE KID
ASTRID was sitting at the waiting area of one of the show's filming sites. It was a medieval village. The site of where Caesar, the protagonist, met Luan when they were younger. He and the actor playing Caesar would have a photoshoot here. Aside from them, there were also the child actors who would play their younger versions.
Truthfully, the photographer in charge could have just chosen to use a green screen as background and edit it later. But he was probably aiming for a more realistic approach. Astrid wasn't against that though. Photos with real backgrounds was definitely better to look at than an edited one.
Astrid already had his hair and make-up on. He wasn't wearing his pope or cardinal costume but simple shirt and trousers. Like a simple villager. Not only that, the clothes he's wearing was similar to the ones the child actor playing his younger version was wearing.