One strange thing I've noticed about Touhou fanart: the younger siblings are almost superior to their elders in almost every way.
You have the Scarlets, Flan is more powerful than Remilia (even in canon). Plus, she even looks more mature than Remi.
The Aki Goddesses, Minoriko's actually behind the regulation of harvest during autumn while Shizuha only changes the color of leaves. Then there's the little jealousy that Shizuha has about Minoriko's body shape.
The Komeiji's... yea, pretty sure everyone knows that Koishi's more powerful than Satori by now. And yet, adding insult to injury, Koishi's more endowed than her big sister. It's something I've noticed in many artworks with these two.