Moon Images from Earth
I occasionally view the Earth illuminated side of the new and old moons with my Mallincam electronic eyepieces. Unlike the sun illuminated side there are no shadows in the view but the features do stand out quite clearly. 

There is little if any contrast across the view that the eye can perceive. Other than looking with the eye I have never attempted any processing of an image so anything is possible.

I think I understand the concept. The earthshine should be different based on what part of the earth is facing the moon. 

Unfortunately the Earth's cloud cover will probably have more effect on the earthshine than the surface itself.

There are thousands of astro images on the Mallincam.io forum. Ask the group if there are any earthshines in the files. If not someone might provide you with a few.

https://groups.io/g/MallinCam