I think you nailed it with the dark color palette, very spooky!

I'd try mixing up the road a little, you can see a very clear repeating pattern. Add a few spots where the grass completely overruns the road since it isn't traveled on much. You could apply the same thinking to the fence by having parts rotting and kicked out where players may freely walk through. There could also be missing tombstones or ones which have simply fallen over.

It also looks like you have a few logs intersecting the fence and the road. On the bottom left there's a tree floating over the fence.

Here's what I meant by having parts of the fence players can walk through. The vertical sections could have holes in them too, just don't forget to show boards laying on the ground.

Reminds me of an old 1980's game.