Well I've never been good at terraining, I decided to try... and i kinda like what I've made, even though I'm pretty sure it sucks, I still think it looks cool.
If you want my honest opinion, the pointy background looks very bad. Smooth it a little at least. Also, put doodads in (lots of them); they are part of the terrain too so always include them when you post a terrain pic. :D
thats prettygood, but you can use the "noise" terrain tool, set your cursor to he biggest, use the noise tool, then smooth 2 or 3 times, and the background it still a little pointy.....