ehh... I don't know about this. Usually one can take your work, put it next to a pic from NASA, and only be able to tell which is yours by noting the space agency's smaller resolutions and increased grain count; but this is obviously rendered and, though I admit its pretty, it doesnit hold up to your normal standards, in my opinion.
I'll give you an honest review, even if this sounds weird: That disc, just below the palm trees... that's what I love most about this image. Odd? Whilst the rest is technically excellent and beautifully aesthetic, it was that unknown orb. Is it a moon? Is is a sun? A large star in the distance? I really don't want you to tell me. Because the curiosity of that one circle has created a world in which I can imagine the distances between the stars, the planet with the palm trees, what lies beyond the horizon, if any beings that live on the tropical planet have yet travelled to any of the systems around the stars that you've painted... it's the curiosity mixed with the setting that creates the world WITHIN the image, and that's truly something to achieve in your work.