Would it be weird to get this sticker?

So I came across this sticker of Marin Kitagawa (from My Dress-Up Darling). The art makes her look way more mature/adult compared to how she’s drawn in the anime/manga.
Canonically, Marin is supposed to be around 15/16, which is where I get stuck (because the fan art looks nothing like a high schooler, it looks like a grown woman in her 20s.)
I like the sticker and I’d want to put it on my personal water bottle or maybe my PC, but I keep overthinking it:
Is it weird if I buy it knowing the canon age?
Do people usually just headcanon/assume aged-up versions for art like this?
Would you personally find it off, or is it normal in the anime/waifu community?
I don’t want to cross any lines, but I also feel like the art is clearly drawn as an adult version, even if it’s not labeled “aged-up.”
What do you all think?
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