Ok, I can't say very much to the story because it's a little bit small ^^.
And for the Screens:
1 one: It's nice, but for me there are to less plants or rocks...also the way is too straight and the bottom of the caveentrace isn't there ^^. But it's OK.
2 one: Hm, in the background of the Battle System the people are as high als the trees and this look very unreal...I wouldn't use a map as a background but these you can download at pages like www.rpg2000.de at "Battlebackgrounds". That'd be look better, I think.
3 one: OK, it's RTP, but for this I like the screen, it's mapped good. But I would take one of the "Mac&Blue" Chipset, which look a bit like the RTP ones. Like Lunar said, the most people don't like the RTP-Chips.
The last one: I think this is the worst one, there're too less plants, lonely trees and the top of the trees is too...black...
I would also take animals in there, which you can also download on www.rpg2000.de at "Charaktersets".

Good luck for your game and sorry for my bad English ^^'