For the card itself: Under the Hebrew writing (which says "Emmanuel", hand-write in green or red ink, "Merry Christmas" or "Merry Christmas, Anne". That adds a personal touch. For the Hebrew, substitute the Bible verse of your choice, or some other good sentiment. For the picture in front, substitute a drawing by yourself or your children, or an image you find on the Web or elsewhere. For the "good things of 2015" list on the back, substitute your own list, or a family newsletter, or a tract, or information on how to attend church, or your own heart-felt appeal.
If you are sending your card by email, as I do for foreigners if I am too late to send them paper cards, you may or may not wish to rearrange the 4 parts so they can be read upside-up on a screen. I am not sure whether this is best, or making the recipient print them out to get the full card. I tend toward wanting to make them print it out.
You should snail-mail the card to your regular list. Also, however, you should attach it in emails to anyone else with whom you communicate between December 1 to December 25. This is a form of evangelism, and also of friendliness, and also it reminds them that this is the Christmas season.