Wow, that Flandre looks kind of mature. She really seems her age in this pic, a bit more serious and all

She looks normal in this pic to me too, but she has that motherly look to me too

Good days, are not only in the past. Flan is doing a great work with Sakuya and Koa.

I wonder, does this mean Remilia is taking care of Patchy and Meiling

Isn't this a continuation of the same young Sakuya and Koakuma as the previous ones by this artist? Remi & Patchy would probably be busy with preparations (or not, rather Meiling than Patchy) and Flan gets to play neesan for change with these two, hence the slightly more mature look.

Ah, nostalgia. So many happy hours decorating the Christmas Flan.