The cover My personalize query letter Samples of clay illustration Samples of digital illustration Reply card for them to fill out and mail back to me. On the pack is a stamp and address label.

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And here's the final piece (apologies on the photo). I rounded each corner, hole punched the top left and looped them together with a swirly paper clip. I mailed it in a clear 5x7 envelope with the cover of the piece facing the back so it would show through and then a 5x7 orange piece of paper with a mailing label facing the front (since the back of my piece had my address label and stamp for the reply card).