Help with understanding quality isssues on my picture

You picture is too small for stock, so that is not the picture you did upload. Show us the asset you submitted. 

Can you help with explaining why my photo wasn't accepted? Too much noise or filtering? Although I'm still learning what 'noise' in a picture means.

By @Taranisa

https://en.wikipedia.org/wiki/Image_noise

What was your rejection reason - quality?

'Noise' refers to digital artefacts:

What is noise in photography

There is a big difference between a photograph and an illustration.

First, it's not a photo. It's AI illustration. The example you submitted is too small to determine if there is noise or artifacts, but the AI bot went wild with random objects. Are these seashells, for example? Planets? Bacteria? Yes, it's surreal, but the objects should still have some basis in reality. Also, assets such as this have questionable commercial value.