First thing I wonder is, what the size will be. Is it more like Eurasia, Australia or Iceland?

And yes, the coastline. I don't like that one, at least, it should fade out towards the water, I'd think.
I just learned this striped pattern coastline and like that even better, then a solid colour but it depends on the style you are aiming for and I don't know whether this would go with the current "Structure symbolizes terrain" approach. - That I like by the way, those are nice grasslands, but I guess this will make working in mountains and hills even more difficult. Can't help you there, sadly.