1) Bypass the free design sites or you will get what everyone else has. A membership tribal design site highlights designs by artist that specialize in tribal body art. They know what types of tribal designs look good where and with what elements.
2) Use a tattoo artist that specializes in tribal body art. If you are going with tribal art you need a professional who knows what they are doing and has done it before. You can recognize instantly the difference between a tribal tattoo specialty artist and an average artist. You will find the real thing on a membership site.
3) Go to a tattoo parlor that adheres to the proper industry health and safety regulations. Things can get nasty quick if you go to a tattoo parlor that is more concerned about making a quick dollar than the proper business and health practices. Your membership site posts reviews of different tattoo studios and what health and safety practices you should look out for.
4) Know what you are putting on your body. You may think you know what your tribal design means, but do you really? You don't want to find out later that the message you are wearing isn't what you thought. A fee based membership design site has experts that explain what certain tribal tattoo designs mean.
Good luck getting your new tribal swallow tattoo!