The smiling face with a faint blush, the smooth hourglass curve of her body, the long hair, the slender arm... There's more than enough. And let's not forget the school swimsuit!
Indeed, sometimes it's sexier to hint at something and leave the rest up to the viewer's imagination, rather than expose it outright.
It adds a sense of mystique that wouldn't be there otherwise.
After all, is this not the reason behind erotic lingerie? Is this not one of the key points of pantyhose? Or even heavy clothing, such as sweaters, that barely hint at the figure concealed beneath?
May the clothing, and the skillful positionings, that hint at more than they show never die out.
Also, I slightly altered the note for a bit of contextual accuracy.
Megassa good work!
(Here, the text reads "megassa otsukare", with "megassa" being one of Tsuruya's token idiosyncratic phrases. "Otsukare", on the other hand, can mean a variety of things that usually fall along the lines of "good work, thanks for your work, that's all/enough for today" and other similar expressions.)