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We are actually pretty much as open as rarible, we require a portfolio link and at least 1 social media acct. / acceptance time is usually only a 2 day or so turnaround, as soon as we get a reply to verification DM we approve :)

We are doing this as we have seen that rarible has a big problem with plagiarism so we are doing a very minimal cross platform verification process.

Ah, I didn't know you were part of the team. Good to hear you pay attention to plagiarism.

Would it be acceptable if I sold a concept with mediocre art? I'm working on a themed calendar using smartphone photos.

The most important thing for us is that you are a real person we can verify, so if I can get a reply from you on secondary social media and you can submit about 5 images (can be on google drive/dropbox link etc. if you don't have a portfolio) that will be fine!