How it is:
How it should be:
Do you see how the grass in the second image has slight shading on the top left and top right edges? This helps to clearly mark the edge. One last thing: the shading will look best if it is only present on the top edges, not the bottom edges. If you also add shading to the bottom edges, you will get something like this:
...which looks gross.
There is a black outline on the cliff in hafen, but it is too subtle to really undo the effect.