Looks empty on top of the mountain in the south, hopefully you will add more floors and decorate it a lil more.
its kind of a odd choice of sprites, like that willow tree with jungle grass.. it might work depending on the rest of the map but on this one i feel its not fitting the theme.
I think it is a good pic tho, its some small things i would change myself but overall its pretty nice.
There are mappers who totally abuse the light ambient to make it look like everything fits together.
I like your works, not much this one but with the correct lights you can easily compensate some weaknesses.