I do have a couple of queries.
The lower bridge looks very flimsy. I get that you might want that first one to be a bit hard for the enemy to cross, but it also has to be sturdy enough for your own soldiers/supply carts/general traffic to cross without feeling that they are going to fall over the edge or through the planks.
I'm having some problems with your shadows. (Sorry about the quality of the image, I used the snipping tool for speed, rather than a screen shot).
On the left, we have this.
Comparing it with the equivalent on the right, there is that little block going down on its own and I can't work out what is throwing that smidgen of shadow.
This is also an example of extremely sharp stepped shadows. Again I can't see what would give such a clear angular shadow. If it's from a distance, it would be softer/more blurred at the edges. I thought at first it was from the cliffs but
1. They are not in one-tile steps
2. They are slightly curved
3. They are too far away to throw such a distinct shadow.
I would also make the shadows at the base of the big cliffs just a tiny bit curved to reflect the shape of the tile. Having tiles which get away a bit from the blocky feel, it's a shame (imo) to reinstate that impression.