Yes, I’ll admit it does feel as though everything outside is limited to white, gray, black, brown, with a few dabs of color. But, is it really? Perception is everything, and snow is reflective- so why not paint your snow shadows as blue, purple, or pink?
You can see what is meant by “artistic license” when you compare the reference photo to the finished painting.
Note: Photos were taken from my backyard last year.