Well, the trees are definently better than before, but I must say that I kind of hate the palette you're using. There's way too much blue in there, for my taste. It works well for shading the trees, but you shouldn't use a blue hue for highlights. Also, the grass looks like the same colors as the tree, but it isn't. That's not right. Go for a more yellowish hue for the grass, (like the axample SirSami posted) or use the same colors as the trees.
You should do something about the dirt too.