Very nice work Chris. The snow looks real icy. Ah, the old Tamiya .50 cal AA Gunner.....brings back memories.
Looks great as is Chris, but can I give a couple more constructive criticms than what have been raised. The Driver and Radio operator's hatches sit up very high on the M10 when open - almost in line with the Glacis plate. Why they did that I will never know, 'cause you can't open them with the turret facing forward and most of the time these guys went back and up the turret to get out. Anyway, your's are noticibaly too horizontal. See these pics for the idea.
The other thing, have you thought about drilling out the headlamps? I use a small diameter drill bit first, and work my way up sizes, so that you don't stretch or break the kit part., then paint the inside chrome (looks better than silver) and then fill with 5 minute clear epoxy. Looks just like the real thing. Do it before the final weathering so a bit of 'dust' on the lens blends it in with the rest of the vehicle. If you want you can even put a wire filiment inside the larger ones.
Lastly, the snow packed around the rear exhaust ports would probably have melted from the heat (same as the snow on the engine deck). Even if the vehicle had been parked for a while there would be no snow so close to the exhausts due to the hull overhang, but then more snow would have fallen on top of the vehicle too.
Just a couple of small things to help. I hope I don't sound like I am being nasty.