Looks interesting so far, really. Good continental shapes, I think, nice water.
Maybe not enough clouds yet and probably the same problem as my planetary map: too green. I'm working on my own planetary map (see this forum) and need to bring in more diversity.
The city lights look very neat, but somehow you need to place cities on the bright side too, because currently it looks like there are none. Maybe try and place little grey splashes?
Anyways, looks neat-o!