On the other hand, I'm a complete amateur in these matters. It would be great to hear from other members about what they think about Mr. Ou's photos, and what they do or do not show us.
For me, this series of photos raises a larger question than Ms. Somova's technique. It has to do with how much we can and cannot learn from still photography, and how much we can extrapolate from that..
Well in my post above, I included links to the source video clips of Somova along with other photos and they can be seen in their entirety and in context.
Moreover, I've found multiple freeze frames of a video clip to be extremely useful in not only evaluating dancers, but also studying and teaching ballet technique. For example, here's a "text book" example of how to do an inside turn to fish which I've found immensely useful as a learning guideline. Here's Baryshnikov showing how to do a proper reveltad and how to launch the step. Proper (Vaganova in this case but applies to all elite companies) tendu a la seconde with legs fully to the side and heels facing downward, not heel forward with legs cheating front. Proper turns in seconde with legs fully to the side from the stunning performance "Lost in Motion".
The photos show every frame of the video which only shows the technique very well, but it's also very useful as an analytic tool for determining accurate flight time and height that the dancer jumped. From this analysis, I've found that Ivan Vasiliev spends 0.9 seconds in the air for his monster double cabriole which is even respectable hang time in the NBA. David Hallberg and Roberto Bolle are both in the 0.66 second range for double tours which is very respectable considering the fact that they're doing proper ballet positions.