That does look much better. It doesn't strike me as obviously synthetic.
One thing to watch out for in the real world is that different areas have different characteristics and that will show as variations in how crinkly the contours are. A silly trick that you can try (depending on your particular software and workflow) to represent some of that variation is to increasingly smooth the non-coast contours as you get closer to sea level. It should be a pretty subtle effect, but it's intending to represent the idea that land closer to sea level tends to be more soft sediments then the harder rock in the mountains. Again, it should be a very subtle effect and may well not be worth the effort.