how can i compare distribution shapes

I'm trying to analize some pictures with their histogram. I've found the histogram shape of the pictures that are correct and I would like to group them according to their shapes. To compare them, I have made the distribution of each one with the kernel method because it is the one that best approximates. But i don't know how to compare them because it doesn't have parameters...

In this figure i specify the importants parameters (A,B,C) to identify a correct picture or a bad one.