I would recommend a message to any groups you administer about this scam. Also, set your email program so that it does not automatically download images in an email. If you are downloading images, and you open an email from a scammer, he will know your email address is live and will add you to his spam list. An email from Pixels or FAA won't lead to being put on a spam list, but any email from a company selling T-shirts will.
People who buy art know how to buy it on a site like Pixels without having to ask. If it looks suspicious, think twice.
While on the subject, just a mention of another scam currently circulating, this time on Facebook. Many of you have Facebook accounts, even in connection with your involvement in selling art here. This scam works as follows. A bad actor steals images off the internet. Popular images are those of fashion models. Then they set up a new account, and use a handful of pictures, maybe only two, and then they make a friend request. When you get a friend request from a total stranger with pictures of a handsome man or beautiful woman, save the images, and then use Google image search to see who they really belong to. If the person in the image is wearing glasses, it probably won't work, but if not, you may get results. One of the scammers used photos belonging to a male fashion model, and my searches uncovered an article in a city newspaper talking about people stealing his images. I was able to contact him and give him a link to the bogus account and he said he would take action. Facebook will not let you report a scammer who is not using YOUR photo. But if you get an invitation, ignore it. I did talk to a couple of these folks, Their bad English (just a few obvious grammatical mistakes) and their demanding my phone number and email address were a clear warning. One even told me he was desperate for money. If you make your information visible only to friends, it prevents them from accessing your friends list, and protects them from the same scammer. However, if you do so and then share content in a group, using a link to the information on your account, non-friends won't be able to see it. Nevertheless, the best practice is to make sure that only friends can see your content, and I highly recommend you do not post pictures of yourself or family members, or reveal specifics about where you live, etc. If you have protected your information this way and you respond to Messenger messages from them, they will be able to see when you are online. If you accept their friend invitation, then they have access to your friends and may try to scam them.