I wanted to picture the reign of Chibiusa, after Usagi and Mamoru's time has passed. When "small lady" just becomes The Lady.
I always pictured Helios as her husband (sorry little sprite kid from the third movie!) and I always figured the Serenities would all kind of fade to very pale near-white as they matured. I tried to incorporate aspects of Queen Serenity's and Neo-Queen Serenity's designs into Chibiusa's flowery pink princess dress from the manga. And her staff is a combination of super-girly stuff and a touch of Pluto's influence and I just don't think Chibiusa is complete without a ribbon haha
Anyway, I got sooo many headcanons while drawing this it was kind of ridiculous but a lot of fun