I like it. I'm not sure how much the detail will survive the translation into the book format itself as Del mentioned. I like the escarpment to the east - that's a rather nice piece of artwork in itself.

I am a little curious as to why all the mountains have the shallow slop to the east and the sharp climb to the west I'm guessing this is just an artifact of the handedness of the artist.

I'm not crazy about the mid grey for the sea. It reminds me a bit too much of bad black and white Mac games from the late 80s - but that's just personal. I think the ripples would tell the viewer that was the sea without the need for the block of mid-grey. Anyway, as I said, that's just personal preference.