Wow theres a lot going on there that I could comment on but ill restrain myself to more important bits.
We had a
galactic / solar system type map challenge recently which you might like to check out and either of your two I would have voted for. They are first class. I don't know why you crossed over the lines to the legend in first map but its all laid out in sequence in the second.
The antialiasing is very nice in all your work. I guess thats from the high res that your using. I thought that there was some hint of illustrator / inkscape in there because of the neat lines then I changed my mind and went for a 3D app. Is it all 3DMax or similar then ?
I like satellite maps too and I write some stuff to make them. The erosion in your land mass looks like a wilbur but the erosion on the mountains looks like something else. Also the lowlands seem to be done by a 3rd method but I cant be sure. The result is terrific. If your able to just slightly tone down the river start (mountainous regional bits) then it would look more realistic but probably less useful since at satellite range you cant see small rivers. I like the flow of silt out to see too.
The labeling of the world going from almost transparent large text up to more opaque white small text is something I haven't seen for a while. I think I remember that Zaon maps doing this and its a really cool way to do it.
I will look at your green / grey thing and take some notes there. Thanks for showing and have some rep !
EDIT -- are you able to post a small section of some of that land at full res. Zooming it up its still fine detail in there at pixel level. Just curious to see how far you take it to.