Danbooru-based image board with a specialization in high-quality images.
alice_margatroid hieda_no_akyuu ideolo kochiya_sanae konpaku_youmu medicine_melancholy saigyouji_yuyuko touhou yakumo_yukari

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Just a thought: could this be meant to be a spin on "Alice's Wonderland"?
I'm fairly certain that there was a bit in the story where Alice was a giant (the result of some pill?).
Now that you mention it yeah, that definitely looks like Young Alice back there (or at least Alice in a "Wonderland" costume)
There's another Touhou image by this artist that's blatantly an "Alice's Adventures in Wonderland" spinoff, so I doubt it's just mere coincidence.
Simply magnificent :O
such detail!!!