hrm... it seems a bit off... mostly becaue of the area with the second ledge... it just... doesn't seem to mesh... If you were to have the section come out more, it would look more natural, I think, but as it stands now, it just looks too man-made... It's all perfectly vertical... Not to mention that this is only a small section of the map, so I can't really tell how this piece intereacts with the rest of your world.
If this crescent stands alone, for example, it would have a much different "naturalness" than if you were to have it connecting to a larger piece of land.