How to make sense of textures?

I'm very new when it comes to textures/models, etc., so I was wondering if there is a general way to make sense of a texture when looking at it as an image (When not placed on a model)? 

For example, I have an Animal Crossing texture that I'm looking at and while some parts make sense (I can see eyes, eyebrows, etc.), some parts are confusing and don't make sense (If a lot of the texture was the same color, for example) and I find myself coloring parts of the texture random colors and then putting it on the model to see if I can make sense of what parts of the texture are connected to what part of the model but this is time consuming and, well, I'm hoping there's an easier way to figure this out without having a guide to the texture. I hope this made sense and if anyone has any tips or suggestions, that would be very helpful =) Thanks