Hi Ulco,
thank you! Of course this is not a pure render, this has been postworked. I've added the texture with the scratches in post to make it look you would watch it through a scratched window of a space craft flying by. These scratches are not part of the planet itself.
There are a few mountains peeking through the clouds, so what you saw isn't an island, but a mountain range. I thought about removing it first, but then I thought it's realistic that some mountains would peek through, so I left it in.
I can post the "pure" render later on so you can compare, if you're interested.
Cheers,
Frank