This one has a really interesting look! The colors in the last version are fantastic, keep them!
There's a mismatch in sharpness between the sea, land, and coastline, in my opinion. The land looks great, but the sea is much blurrier, and the coastline is razor sharp and a little pixelated. The latter can be fixed easily, with a small blur effect. The sea texture might need to be replaced if you want to make it sharper. Which I'd suggest
-Max- has a good point about the riverbeds too.
But overall it's really cool and I look forward to seeing the progress