Actually Instagram itself has some contact forms for that kind of stuff. What I'm doing for some time now is to put my logo on the pics. It's a bit more of an effort and of course it could be removed quite easily via Photoshop etc. but that would be an effort again. Those kind of people are normally quite a lazy bunch. Within the Instagram underwater photo community you normally get credit in reposts. I had some smaller issues but some followers of mine actually commented underneath the pic an put my handle in there so I got noticed. In most of the cases the reposter puts your Insta handle in the post, especially the larger uw accounts which only tale pics from other folks give you credit. And you'll get quickly some more followers.
I either put my logo directly on the pic when I export it from Lightroom or via Marksta on my iPhone.
Don't you normally have to send in the original pic in contests?
And one thing to keep in mind: the resolution on Instagram is not that good in the end. So if you steal a pic there the quality is quite mediocre. [emoji12]
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