Rille's smile looks a little... large, don't you think? She looks a little too pleased with herself. Could be she just played a prank on someone - probably her brother.

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This was drawn by  crazymelimelo as one of several sketches. Go look at her offer and order some for yourself! They're super affordable and as you can see very good!

And, at least for now, for every three sketches you buy, you get a free chibi. I felt Xodiac's sister would be a better subject for the lighthearted style than Xodiac himself. This picture encapsulates Rille's personality perfectly, her vivacious energy on full display.