Reimu-and-Cirno [2019-01-24 22:26:54 +0000 UTC]
It's actually even easier than that. The props are labeled with their scale relative to the characters. The particular prop in this comic is at a scale of 200x, which means all you need to do is divide the character size by two and that give you the correct size for the prop. If Cirno is 100x, then the prop size is 50x.
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