That sort of monochromatic coloring could work, especially if the textures you're going to use will conform to it. That said, the cloudy ocean would be a problem regardless of the color scheme. Maps with this kind of sea are pretty common here because the style is used in some tutorials, wich is unfortunate because it's so prone to looking more gaseous than liquid and also tend to give you that "the landmasses are levitating far above it" impression. It gets even worse when you can't use the usual blue color to indicate that it's a sea.