Looks good. I agree with Ashbad though about the proportionality.

That looks a lot better! Wow, adding the dithered castle tiles make it pop out just that much more. And the water is much more recognizable. Great job!

Wow, that's a really nice looking screen mockup! The trees in that particular picture are fine in my humble opinion. Castles and mansions often times have small shrubbery that looks like small pine trees. The happen to fit quite nicely with this particular scene. However, designing larger trees for other overworld areas wouldn't be a bad idea. Very nice looking so far.

well, I think if you're going to have trees be that size, then they shouldn't be triangular. That suggests that they're redwood trees, which tend to grow to be gigantic...

@Zippydee, it doesn't really, simply because of the size. Many pine trees share that shape, large and small alike.

Or maybe darken the right-facing slant wall so that the shadows pop a bit more?

So just a bit like yours? (I believe they're pines too)

I tried to see what I could whip up in ~5 minutes.  I've never drawn a pine before so it ended up looking like a oak-maple cross, but it can be staggered quite easily and looks pretty good: