I'm not quite sure if this is what you are looking for, but as i understand it you want to put the url for the artwork "out in the open" on the cachepage. (loved the artwork btw!)
If I've misunderstood what you're looking for I'll just blame it on my poor english
Maybe something like this might work:
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To get a copy of this image on your profile, cut and paste this url onto your profile:<br>
http://img.geocaching.com/cache/0b7195d2-3094-4ecd-8156-208d72426e54.jpg<br>
Rember to put img src= in front of the url, and brackets < > before and after
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Looks like the url gets shortened when i post here, you will off course have to put the full url on the cachepage
Edit: dakboy's way of doing it is way easier :-)