メイド服姿(pixiv #123537144; post #8369462)の大人バージョンです。
この衣装はデザイン的にも大人姿のほうが似合ってますね。

後ろ姿も描いたので2枚目に載せておきます。

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Source: post #8697248
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An adult version of her in a maid outfit (pixiv #123537144; post #8369462).
The adult version is more suitable for her in terms of design.

I also drew a view from behind, which I've included as a second page.