I just finished most of my new snow mountain scene. Right now I have half the mountain fall, and the other half a wintry scene. I might just do the entire moutain snow. I dunno. I think it looks badass.
The backdrop even has some snow-cap mountains in the far peaks.
I still need to add the ground cover, and a few other things like ski’ers, deer, and black bears.
the mountain itself is more of a detractor than your snow coverage. I’m not sure if anyone has mentioned it before, but it’s pre-made aspects do a lot of harm in the realism factor, at least from the pictures.
the transition between seasons as you’ve shown is too dramatic; a gentler tapering of the winter effect might look more plausable. Sure, I’ve seen it snow and accumualate on green grass, but it looks damn odd in real life too.
I wouldn’t worry about skiers and wild life, maybe fill in a few more trees, maybe even throw in a couple of deciduous types sans leaves. Or even with a few brown leaves on.
I used a flocking product called Santa Snow, it’s only temporary and wipes off very easily. It’s in a spray can I got at Hobbylobby. It’s used for spraying windows and such to get that snow dusting.
I spray the tunnel portal, and the rock wall. And then I used Woodland Scenics Soft Snow flake.
I think you’ve got a good start here. Add some yellow leaved birches (or aspens) in the fall area and bare to mostly bare deciduous trees part way into the snow side. Make the transition very gradual. A little bit of snow and ice to the right side here and there, getting heavier as you move to the left. Perhaps a bit of melt water running down from a sunny spot in the fall area.
Once you cover the seams in the rock castings with plaster, add loose talus at their bases and wash the whole escarpment with paint, it should look great. Remember that nature abhors straight lines.
There will be a coal mine where you see the spot where no trees are, so that should help with the transition as well. I already have the Aspen trees there.
I’m also going to add some trees on the ground along the rock wall, to help mask the rock castings and the two pull out sections for access to the track.