stefanzzz, your indoor lighting is nice, but mapping could use some work. Try not to make cliffs, water, etc. too straight, and avoid placing objects like trees, rocks, or bushes in a straight line. You could add more objects in the cave. Also, try varying cliff heights and texture (instead of the rock border, try the grass) for the mountain map.
nachos, same thing with caves, they're a little too straight. Also, in your second map, there's a problem with cliff height. The water on the right extends from the top of the cliff to the bottom; that needs fixing.