It's difficult to get a good photo of the Moon at a small crescent phase. The illuminated area of the Moon - 12% in the photo below, according to a resource from NASA - is small enough that a camera in automatic mode will need to hold its shutter open for a relatively long time, long enough so the image becomes overexposed.
|Waxing crescent around 5:10 PM on Monday, December 10, 2018 from Nanticoke|
|Visualization from NASA's Dial-A-Moon|
Comparing the two images above, you can see that my photograph is "overexposed" relative to the visualization. I had actually cranked the exposure all the way down, and I am very happy with some of the details I was able to capture. But in an effort to make my image more closely match the Dial-A-Moon visualization, I reduced the brightness nearly 50% using Pixlr Editor.
|Top image, brightness reduced by about 50%|