Following a link from an ad on The Show, I had a look around PhotoShelter on Friday, and decided to apply.
I submitted ten images, but didn’t actually regenerate them to match their requirements. After reading their standards later, they should have been saved with AdobeRGB, not sRGB, should have been output at a higher JPEG quality level, shouldn’t have been sharpened, and shouldn’t have had their colours played with as much as I did.