"Not actually canon to the official story.
This is my head-canon that after the events of Metro Exodus, Katya and Stepan decide to have a another child after settling down. Nastya is really anticipating the birth of her soon-to-be born sibling.

I am not very proficient at digital art, I prefer using physical supplies because it feels more natural. Despite that, I think the picture looks very saccharine for depicting a bright future for Katya and Nastya."