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It is a remarkable feature, for sure. Being able to pick out the tiny craters inside it makes for a test of seeing conditions and quality of optics.
And spend two hours doing a sketch of it, and you will notice the shadows creeping across the floor, either shortening or extending all depending on the phase you are looking.
Also, this early sunrise over Clavius also helps reveal some of the very subtle, short features on its floor. By short I mean not very tall, so these texture shadows are very short lived. And viewing the same area when the sun is setting (as opposed to while it is rising as in your photo), it allows for other features to be visible as all features require the right angle of illumination to be noticed. Variations in the floor caused by ancient magma shifting of the floor, unseen fault lines, ejecta craterlets (especially those from an oblique asteroid impact), other riles, volcanic domes (yes, there are volcanoes on the Moon! We know there are lava fields on the Moon, but how many of us made the connection that if there is lava then there would have to be volcanoes too) and crater rims isolated by shadows. Like a totally new place!
This is one thing I really enjoy about sketching the Moon - one becomes uniquely familiar with features. And when the lighting is totally different, the differences from one phase to anther can be quite striking and even breath taking as these "new" features were not visible at all previously! The Moon has so much to offer, and it's cursed status among most astronomers is so unwarranted.
Alex.
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