First one is good. Second, third and fourth are wierd. Can the peaks really be that high, and have such a small circumference?
The first one is more realistic... the rest are wierd
. The fourth has a wierd texure. See... no mountians are just one colour... with brown spots all over them.
Try changing the texture for the fourth one and it'll look better
For the 3rd one... you might consider blurring the reflection in the water... Right now it looks like a floating fortress... The waters nice..., but its still a little wierd..
The one I made looked like jelly
like some said... but then it had different textures... making it look more realistic... kinda...
Although the peaks and points of your mountian look better... the texture I dont like