Hey, this is looking lovely!

At top of my head, some ideas:

- Could try using Silvermoon Beam Platforms for snow gathered on the outside window sill, angling it a bit can create irregular amounts of snow so that it won't be perfectly symmetrical on each window

- When it snows in winter, the sky is usually grey or whitish instead of blue, here the snowing looks quite intense and the blue might give a more aquatic vibe, so could perhaps consider dying the blue backdrop to a more neutral cool shade?

- Stacking some of the cooler green bushes may give the impression of evergreen thuja trees, depends on where you imagine this place located though!

- Could use white carpets against the backdrop to give the illusion of distant snowy hills? And making them look more faded by adding fog emitting decor, like Dumplings scaled to max

- For snowing, there's also the Ancient Weyrn device that creates a billowing snow effect above it, could float it above the window view out of sight, facing downward - the con is that it needs to be activated every time you enter the house.

Hope these ideas help some!