Some artists use a palette knife to paint. I use one to mix paint - and scrap it off. The lower dark left section I painted three? four? times. If you add up all the changes it was more than that. Just as I thought "that is it", I'd take a second look. No. Time to move some paint around, add lighter and darker areas. After taking a break or seeing it the next morning, I'd decide to scrap off that section and start over. There are just a few more adjustments to make so I think I can put down the palette knife and move on.
For the foreground snow I am increasing the hue. There are passages of cerulean blue along with the purple tones. Below, the last of the "white" is painted.
The right lower side was especially tricky. I wanted some detail but not so much that your eyes were drawn to that spot. It took some playing around so the paint would suggest detail without screaming look at me. If you click on the image to see it larger, you can see a couple of splashes of "royal blue" (ultramarine blue, cerulean blue, titanium white) thrown in to give depth and tie the foreground to the distant background trees.