In related news, the WC Pioneer team is also working on the look for their planets. The final designs will note cities, have dynamic clouds and tone down the reflection. These samples already look great though. You can offer further suggestions here.
Keep in mind that we've not even begun to touch clouds though. These planets will not have uniformly Californian weather when we're done. They're all procedurals mixed with satelite imagery, so they're infinitely randomizable.