I think spamming on the Usenet would be defined as unsolicited messages with a commercial agenda, even if it's on-topic. If you're trying to sell the surfers something, it's probably spam. It's not spam if you're uploading free pics for the sake of porn.
Realistically though, I don't think you'll get complaints considering 99% of the posts are already of a commercial agenda. If you just put a tag of your site URL in the image you're posting, I don't think you'd have any issues. You might have a different experience though if your posts don't consist of any content... and it's just a message that says "Click here for Hot ARS Bitches"... that would just be blatent spam.
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