my rules for using my work as reference are as follows: for non-commercial works, credit to me and the original work and a link, if possible for commercial use: as above, plus 20% of proceeds resulting from use of image
Hmm... Well, on a card, you can only list the artist(s). For example, look at this: [link]
At the bottom, it shows the names of two artists. For example, I could post your name and then my name, so (to give an example) it would read "Jack Smith & Bob Joe". If you don't want to, that's fine, it's just an idea.
I love Hocking Hills. It's only about an hour drive for me so I try and make it down there a couple times a year. Anyways, congrats on the DD. Awesome shot of Hocking Hills. I actually know exactly where this was taken lol