Forcing link to my site when sharing a picture hosted in my site?

[Portucuenta]

Is it possible??

I have a big quantity of pictures hosted in my site, and I don't care that this are being shown over the web, what it disturbs me, is that if they show it in another site, they don't link the picture to my site...

Is it possible to recognize and force this?

I already encourage the users to use a provided codes in UBB and HTML so they can both post the picture and link to my site, but they don't seem to use it...

Apologize my english, to make it more graphical, I am looking for something like this:

Good:

Wrong:


Thanks for your time