I haven't started actually ballasting just yet. In 63 years and four or five layouts, I never ballasted! I got quite a number of bags of WS medium gray blend. I have looked in several volumes of The Burlington Route in Color, and it is interesting to see the variation in colors at various places. The gray blend looks like it will be a good choice for some of my mainline track, especially where there are two tracks adjacent to each other. OTOH, in the yards and other places the ballast looks pretty dark brown/black, probably just dirt. I do notice on the mainline photos, the ends of the ties are more exposed, more like your siding. Also, the center of the track doesn't look as dense or is darker. That may be due to the shadows and dirt/oil deposited by the trains. I have looked at using WS Fine, but it just looks too fine...more like sand.
I DO like the way your ballasting looks. Haven't started gluing anything yet. Just trying about a six-inch long section to see how it looks before I make it permanent. When I do, I'll try to post some pictures. Might take a while, though as I have quite a number of turnouts and branches and will have to be careful not to foul the points and frogs.
Merry Christmas and a Happy, Healthy and Safe New Year!