OK, I've gone back and analyzed my data more carefully. It's a pity that this eclipse didn't present itself in more favorable circumstances to allow more careful analysis, but this is the best I can present with my data. I took ten photographs during the maximum eclipse, as well as two hours later, after the eclipse was over. I have now stacked each set of ten images to improve the SNR of each image. However, before stacking the images, I imported the raw NEF files (Nikon) into the program RawTherapee, and then exported tiffs that corresponded to linear color profiles, with no tone curves added. It's important to realize that when working with jpegs, or even with raw files opened in a raw editor like Adobe Camera Raw, there are nonlinear tone curves applied to the image whether you realize it or not, before you even see it. This can complicate exposure adjustments. I stacked the raw linear files and then converted the resulting stacks to grayscale images in Photoshop and then normalized the exposures. The image captured during maximum eclipse, which was low on the horizon, required an exposure increase of 0.35EV to equal the exposure of the image captured two hours later using the same camera settings. I then made an animation of the resulting images. This showed a clear darkening of the north polar region during the eclipse. Shown below are two animations. The first corresponds to the linear images, transformed into sRGB color space, but without any additional modifications of the tone curve. These images appear much more bland than standard images from a camera (either jpeg or processed raw images). The second animation is with an additional contrast boost added. Both animations show clear darkening in the eclipsed region, with essentially no changes in other regions of the Moon. The only odd finding is that the region directly north of Mare Crisium, which should be impacted by the eclipse, does not demonstrate any darkening. Also of interest is that you can clearly see the effects of diurnal libration, as the Earth rotates and my vantage position on the Moon changes slightly, causing an apparent rotation of the Moon. Other slight differences in the two images, such as sharpness, are caused by the changing conditions and altitude over the two hour period.