It's just the quality of the reproduction and how well the author/photog knows how to transfer their media with the highest resolution without degrading or losing pixel/data count when publishing to the internet. And how much bored panda will except in file size. There are many high quality shots in that session.
I'm also talking focus and depth of field, where in #23 I believe the photog used what we call hyperfocal distance technique for pulling focus in the full frame. There's a branch in the upper right that appears to be within three feet of the lens, which would fall out of focus being too close to the lens and distance focused for hyper.
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