Ok first of all you should convert the tga files into another format, so that people don't have to download the screenshots to be able to look at them.
Ok well you need to use a bit more tile variation in your terrains, and also in the 3rd one the path looks way to straight, you need to make it a bit more random so its not so straight. Also in the 3rd one there is a problem with some of the trees towards the back, with the texture on their trunk, which if possible you should try and fix.