QUOTE
-its a little flat. I think you could have used more small hilly slope areas.
Well, many places ARE flat, even in the real world. Look at the netherlands.
About the eye candy, I suppose you could have used better detailing. It looks like you kept brush 2x2 on and drew the terrain quickly. This is IMO terribly wrong. Paint the terrain with a 1x1 brush, and don't make chunks of detail. Make smaller pieces and detail realistically. I don't think the same repeated pattern of detailing is good, or that having a detail type surrounding another. Just detail with small pieces, and not chunks and you should be fine for now. Do not make the detail by holding the auto draw buttons in and draw the detail quickly, big and blocky, place them down tile by tile realistically while keeping the blockyness to a minimum.
Perfection can never be achieved; it's merely approachable.