Hi, my item was rejected, so I just want to get some feedback from you to improve and make better stuff. 
And for the content:
Do I need to make more styles and less variations or one very vey good work with many variations will be better?
Thanks
Best to start by focusing on getting one piece done really well. This one looks very dated to me, the radial blur effect looks dated and too simple - plus it would be better with curve of the Earth instead of a straight line, and some more impressions of detail like land and clouds on the planet. Plus this same idea but with a night planet and city lights could look good.
You gave me some awesome advices, I’ll put more effort on the details on my next work, thanks! 
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