To add a bit more mystery to the matter, I did look at a screencap, and the poses are very similar, but not identical in a number of ways. For instance, the screen cap shows two locks of hair coming down over Yue's left eye (on the right as you look at the cel). Your cel has three locks. Also, the screen cap shows the front of his collar in the light, while your cel has it all in shadow. But the pose is so similar in so many other ways that it seems unlikely that the studio used it in two different spots.
Also, there is another cel from this sequence, the A2, currently for sale on YJ:
http://page10.auctions.yahoo.co.jp/jp/auction/m54780970
And that one comes with a douga that
is shaded on the front. Yet the cel has the tighter close-up, three locks on the right, and many other differences from the screen cap. But -- one last puzzling detail -- the collar in the YJ cel is partly in the light in exactly the way as in the screen cap.
Huh. I'd have to assume that both yours and the one on YJ are test cels -- not the less lovely for being so, however.