MicrostockGroup

no, I think it's not legal. Unless he took pictures himself....

Contact SS support about this. They have so many cases of rampant theft of their images that I don't know if they'll be able to stop this, but you should at least let them know. It may be that the images came from elsewhere, however, as this site (unlike so many of the others) isn't actually advertising that they're SS images.

I've done a fair bit of copyright violation complaining, and all the sites require it to be the copyright holder who makes the request to take down the content. So if we know who the artist is, we can certainly (and in the past I have done this) contact them to have them make the complaint.

When a site has many items from one source (and as I said, this isn't as clearly sourced from SS as some of the other stolen content has been), it seems like getting the site involved to lean on the violator to take the whole lot down at once is more effective.