I'm fascinated by these shots of the Pandas (including the shots others have posted) and cannot help but think how beautiful this animals are, and how privileged you are to be able to see them, and how good a job all y'all are doing of shooting them.
Technically, there are some challenges in shooting the pandas due to the contrast range that they, in and of themselves, present to the photographer. You are traversing a range from a very rich black, to a quite clean white, and there's a need to, within that range, maintain the details in the fur.
But wait; there's more. Let's look at the eyes: surrounded by the fur, there's still some detail that can be discerned from the eye itself.
We basically have blacks within blacks, and whites within whites.
Photographing that with any degree of success is no easy feat, and you're all doing wonderfully well in this regard.
Keep it up.