Angie's whole family is scary, man. COOL...but soooo scary.
Despite the fact that this may, or may not have been, a warm-up of sorts... I'd consider cleaning up a bit of the snow patches so they don't look so spaced/brushed a la Photoshop. That would tighten up this piece something SEVERE, because everything else is phenomenal.
Color pick your happy medium of the color/value you like best, and go over that spot so that you aren't ruining the value you're trying to even out. You can definitely build up gradually and smooth out the discernible brush shape/size by dumbing down the opacity. That ought to smooth those out nicely. This way you'll have variations in the snow mounds...minus the obvious brush shape/spacing.