Okay, second draft. I've added rivers, forests and mountains. I changed some of the base biome areas, mostly pushing habitable land and icy areas around due to what should be the prevailing ocean currents. And I added a small cold desert in the S part of the central continent. I smoothed out some of the continental coastlines and added some smaller islands to add some diversity.

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Think next I am going to focus on adding cities and major roads. Probably will be a lot of tweaking and refining of what I've got so far along the way.