How to choose the best place for such a cool sketch?
Let's start with that you need to understand, whose initials you are going to put on your body. If this is your own name, and for certain reasons you consider it important to create a hidden tattoo with it, then it is better to choose a hard-to-reach, but not the most intimate place. For example, the back of neck under the hair, the shoulder blade or the area between the fingers is quite suitable for such signs. It's popular way for guys. Another thing (and it's more spread among girls) is if you want to put the initials of another person on your body. It always looks very cute when people get a tattoo in the shape of their lover's name. And for this, they often choose intimate zones that are accessible only to the partner's eyes. For example, the lower abdomen, a small area under the chest (on the heart side) or the inside of the thigh. Some people also put a hidden tattoo behind the ear or around the collarbone. Anyway, such a cool sketch usually has small size and, look cute and is easy to hide.
You can also implement the initials in your existing tattoo. It is quite simple and unlikely to take much time and nobody will see the new symbols in the place of your old sketch, if you do not dare to show them yourself.