FacesThere are a few things you might want to think about when it comes to making the design. Putting realistic faces on cards can be risky. You can run into legal problems if you print a photograph of someone who
has not given you permission.

Also, customers often have a specific person in mind when they buy a card. If someone wants a birthday card for their mother and the picture on the card is of a young model, they may feel it’s inappropriate for their mother. A Hispanic or Afro-American customer may not want to buy a Caucasian face.
If you have to use faces, make them vague, so they don't look like anyone in particular. The only exception to this would be if you are specializing in a line of ethnic cards or are using caricatures in humorous cards.
Black and White Cards
Black and white cards, with no other colors, can be difficult to sell. Unless you are using block prints or paper with a deckled edge, your chances of selling a card with these two colors can be limiting. Black and white cards don't always jump out at customers on the store shelf. Remember, you are competing with all the other multiple colored cards.
If you add color to a predominantly black and white card, you can use colored paper with a colored envelope. You can also try unusual patterns or textures. Be creative and throw a splash of red or orange onto the card by using a rubber stamp.
Horizontal cards
Horizontal cards are a problem for retail stores. Although they might be more attractive and easier to design, they use up too much shelf space. Every square inch of retail space is worth money and horizontal cards take up more space than vertical ones.
This doesn't mean that you can't design this type of card, but avoid designing your entire line with horizontal cards, so the store has a choice.