Mediation between processing, non-processing and museum photos

Hi everyone,

I've recently begun submitting content to Adobe stock and luckily, some of my images have already been accepted, however not the ones I was from my own perspective almost convinced they would make it. The reason in nearly all of thoses cases are "problems with artefacts". Well, the problem with occuring artefacts can be solved easily with respective software, but the explanation also contains the following line: "we found that the picture may have been overly-processed or contains too many artefacts/noise." My focus is set on the term "overly-processed".

I understand that customers of photos wish to add their own special effects, filters etc which requires the content to remain widely unprocessed apart from basic tweakings such as contrast, brightness and so on. But when is too much too much in accordance with the guidelines? Because on the other hand I read the sentence on the site: "Please try to work your photos so that for customers, only little to no post-production is required." Makes me a bit unsure on what to do, how far to go and what to omit.

Another thing I came across was that, according to the guidelines, pictures of Museums (the art affected itself is clear to me) are not accepted when there had to be an entry-fee paid. But what about museums that are free of charge to enter? Especially in London, UK but also elsewhere in the world I know this is the case. To give a concrete example, I have an in my opinion acceptable image of the British Museum's entrée, am insecure now tho whether to try to submit or not. The British Museum as most of the other London museums is free of charge.

Anyone a good advice for me?

Thank you very much in advance for your replies, I'm eagerly taking any hint into my future work process.