Anyone who uses very high resolution cameras to photograph punts knows it is not the exception to see small amounts of fecal matter on a wgs anus, particularly unless she has prepped for rimming. The same cameras pick up every crevice and so on of everything, including the anus. It's a downside of very high resolution cameras actually. If you, for example photograph a face in portrait, every imperfection is very noticeable, and someone who appears to have clear skin in person will have every little imperfection in the picture, more noticeable than in person. it's the real reason photo editing originally became so common in commercial use.
The point is really that under such magnification, and such scrutiny, superficial cleans are exposed. And it isn't that uncommon, I have to say. There are some wgs I have photographed who, even under such a lens, can be seen to be immaculately clean everywhere every time, which I quite respect as it shows a thorough clean before each meeting I have, beyond what you would expect me to be able to tell. one such wg was a Romanian pornstar.