To complete a home made card, the inside should be finished to the same weight as the front of the card. At the very least, glue a white piece of card stock on the inside right. Balance the weight of the front of the card to the middle. If you stamp a sentiment or picture, add a third layer of cardstock with the sentiment on it. This allows the weight to be build up and allows for making a mistake with the stamp if you do it before you insert it in the card.
Thank you for letting me use my own blog to protest/whine/complain about my card exchange with others.