The thing that leaps out at me is that the variation in ocean color doesn't seem to interact with the land masses. I naturally interpret lighter shades of blue as shallower water, and I expect to see shallower water concentrated around land masses forming continental shelves. I know you aren't trying for a literal style, but departures from orthodoxy should be self-explanatory. I'm not thinking along the lines of the contest--the kind of change I'm suggesting is fundamental and may not be simple depending on how you created your land masses.
However you created your land masses, they came out very interesting, with lots of scatter and plenty of lakes. I like it.