This is a spoiler-filled feature for Maquia: When the Promised Flower Blooms.
Though the ending to Maquia: When the Promised Flower Blooms was rather straightforward — Maquia accepts loss as a part of life, and though sad, celebrates the time spent with Ariel — the very final shot after the credits leaves room for speculation. I had the pleasure of sitting down with Maquia: When the Promised Flower Blooms’ director and writer, Mari Okada, at Anime Expo to get some of my biggest questions cleared up and learned some other interesting information about the film and Okada too.
After the credits roll, an image of Maquia, Leilia standing next to the Renato, and a number of other people near the Iolph people’s original home is shown. A woman with red hair stands out most. According to Okada, these other people are all descendants of the Iolph.
Source: IGN.com Maquia: When the Promised Flower Blooms Ending Explained and Other Details From the Director