Thanks to everyone for your very useful comments, which have really helped my understanding of the requirements. I really appreciate all of your replies.
Many thanks for the feedback on this. If I can fix the saturation and over exposure, I'll re-submit, as this photo sells really well on Shutterstock - by a factor of 4 compared to my others
I'm not sure why this is the case, but many moderators are American and tend to have a subjective approach to photo reviews. I've also noticed that their perception of aesthetics differs from that of people from other countries. As a result, if you're from a different country, your photos may be rejected more often based on their personal preferences. I believe there's too much censorship involved. People have different tastes and appreciate different styles of photography. I for example like the New Topographics movement that steers away from traditional compositions, framing, colours, sharpness etc.
I'm not sure, how you got this nonsense. We do not know where the moderators come from, but hiring Americans for such a task would be very expensive. Operations like this are normally done from low wage countries, with limited support from high wage countries. Image quality can be checked from everywhere in the world, and the criteria is not biased on personal perception of aesthetics. If you contribute for stock, you need to submit neutral assets, that the buyer can modify to their needs. Submissions can be artistic, but they need to meet the quality standards. Please note: stock is about craft, not art.
ABAMBO | Hard- and Software Engineer | Photographer