Yeah, I'd settle on one or the other, I think.

The cart tracks look a little more like car tracks to my eye currently, although magical carts requiring no animals to pull them would produce something similar. And if reduced in size considerably, they would work for sledge or ski tracks.

For animal-pulled vehicles though, there should be prints - or more simply for this style, perhaps, simply a muddied/shadow pock-marked region - between the outer tracks.

Sleigh tracks might have a central runner track as well as the two outer ones (actually at the centre-front of the sleigh, but that's not very relevant to the look of the tracks), just to complicate things still further!

Oh, and some suitable carts and sleighs would be nice to have as well. ⛷️

Not merely tin (or other sorts of metal) roofs, but any smoother kinds of roofing material, such as tiles or slates. The idea is to substantially roughen the surface in some fashion - using rocks or logs sometimes (still to be seen in the Alps today in places, for instance). Reason I suggested them is, and depending on the snow thickness, they can break-up the appearance of the smooth surface of the snow seen on the roof symbols currently.

Thatched roofs tend to be pitched steeply enough to shed snow (and water), thus snow shouldn't accumulate as much on them (in parts of Japan subject to heavy snowfalls, the thatched roofs have a particularly steep pitch, for example). This isn't so much because thatch can't cope with the snow or water, but because thatch is usually lighter than other roofing materials, so may not be sufficiently supported by the underlying roof structure to carry the additional weight of substantial snowfalls.

Assuming the tunnels and caves have been burrowed into the tree, you might want to start with a blank sheet and draw the tree-rings onto that first (and maybe add the current outer bark layer as well, to fix the tree's size), so it doesn't look as if the rings have somehow retrospectively fitted themselves around what would have been nonexistent internal features when they were laid-down. (As drawn, the web and misty (?) caves would have been in the air outside the original tree when the rings were being laid-down, which would have been tricky at least, I'd suggest!)

I seem to vaguely recall we may have had this conversation previously, but the mountains look a little insubstantial right now, as if many of the arête limbs are only paper thin. I appreciate that wasn't necessarily what you were asking about right now, but it is what first occurred to me!

Zooming-in to the enlarged image, I agree with the notes made earlier, where it looks as if the canvas effect is more pronounced on the paler colours, and not at all (as far as I can tell) on the water. Oddly though, the effect is quite obvious on the tree symbols, which is a curiosity, given they're the darkest objects on the whole map. That could suggest it may be more an issue with the texture on some of the bitmap fills which is causing the canvas effect to disappear, rather than simply the darkness of the hues.

I'd agree that it would be useful to have the canvas effect as an option, rather than a fixed default.

Just to be contrary (well, not JUST...) I rather like the pale desert, but then I can see that would be interesting to use as a cloudscape texture (especially the way the mountain peak seems to be coming up through it), which I suspect may not be everyone's first choice as a setting.

☁️🏰☁️