Looks quite good so far Dwight. To me it looks representative of a partly worn camo job, where you can see the places where it was put on a little heavier than others.
Usually the winter camo was hurriedly put on as the crew didn't want to spend all day at chores, particularly when it was really cold
. The whitewash was often put on with straw brooms, or rags tied to branches as this was quicker. The longer broom handle made it easier and kept the stuff off the crew clothing; The crew often just poured whitewash in patches on the vehicle and swept it around a bit.
I have never attempted a winter camo on an Allied vehicle, but I've done a couple of German vehicles (the old ESCI Demag and the old Tamiya Sdkfz 7/1with the Quad 20mm flak). After doing them I decided that I hate modelling snow
.
Not sure of the dio you intend, but if you are going to do even a light sprinkling of snow , you might consider a bit of sticky mud, grass, etc on the running gear and hull. Tanks don't stay on tarmac, and even frozen ground gets chewed up by the weight of these guys. Also in heavy snow, the compacted ice sometimes sticks to the running gear an side of the tracks (particularly cleats), usually where it has been heaved up onto non-moving parts whilst the vehicle was moving.
I have seen real snow for about 5 minutes of my life (I'm 42!) and I guess there wouldn't be much where you live either
. My ideas had to come from looking at my reference books. Guess we might be able to ask Shermie, Captain Caveman or some of the other Northern Hemisphere guys for a little lesson on what an icy winter really looks like