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Do you think it's good? How can you spend three hours on this? You must be somewhat new to the WE, and doodads, because I could whip that up in minutes. I don't mean to offend you, but there are so many things wrong I don't really want to critique it... but I will.
1. Flat - Never leave your terrain flat. It looks boring and not very natural.
2. Environment - Even in a terrain that does not focus on environment you should still make sure that the environment is good. One ugly thing and it ruins a terrain. Add trees, rocks, plants, and small doodads.
3. Distance Fog (DF) - This is under 'Scenario - Map Options'. I'm not going to tell you how to work it, just figure it out. This will add to any terrain I guaranty.
4. I'm going to be blunt (not that I haven't been already), that steam giant is ugly.
This is a robot! I don't expect you to make something that good, but you can do better than this.
5. Tile variation - You seem to have tried, but it's not good. Use more tiles, and make it more natural. It just takes practice.
6. End of the World - Never show the edge of the map. Ever.
Well that's a few major ones. Try a new terrain, and make sure it's of some quality before posting it.