Well as Ixith said, you seem to know the basics of mapping, and you made a good start, but here are some things to improve on.
Right now you should mainly be focusing on slopes, cliffs can be used for height variation but you can't use only cliffs, so to patch those flat areas up that cliffs just can't handle, use slopes. Even better if you could combine cliffs and slopes, to make some really nice looking and twisty terrain, just as the world is, but this isn't your main problem, use this when you get more experience.
When you get those slopes on to your map, you should try and combine waters with cliffs. Place waterfalls, water caves and not just placed randomly, but think how the water would find it's path in the real world, what's the source etc. While doing this, you should also try to make twisty cliffs that merge with the surroundings.
Lighting makes your maps look alot better. One thing is to set a nice lighting that affects the whole map, the other is to use lightposts. Pre-created lightposts just won't do it sometimes, so that's why you should edit your maps lightposts, this will give your map the attitude it needs. More about editing lightposts can be found here -
http://www.tiberiumweb.com/forums/index.php?showtopic=972.
Follow these suggestions, look at other spotlighted maps, be creative, always pre-plan your maps and you should get a spotlighted map rather soon.
This post has been edited by eXit: Nov 8 2007, 05:34 PM