There are a lot of prejudices about tattooing dark carnations and many unanswered questions from people coveting ink. The very first thing we could advise is to make sure you found a tattoo artist with dark skin clients in his portfolio, which means he or she has got the experience (don't trust him blind) and of course, skills.
Tattooing tanned skins is different than tattooing pale skins, not more difficult nor impossible. As ink is injected under the skin, the melanin pigment, present in the cells of the dermis, is reacting just like a filter, hiding some colors that are clearer than the skin. Darker the pigments are, less transparent the skin is and less visible the tattoo would be if you pick clear colors and thin lines. But indeed, color tattoos are possible for people of African or Latin American origins: just pick bold colors, darker than your skin tone in summer. Black, red and green inks are often recommended but an experienced artist could tell you which colors would suit you the best, as well as the type of design, shading variations and line thickness possible in your specific case. Because every skin is unique, just like you are!
We also have a lot of questions about watercolor and white ink tattoos on black carnation. They are not impossible, but could be as problematic as for any kind of skin, so your tattoo artist is the best judge. Take the time to talk with him, and also with your dermatologist to know if you could be prone to keloids, those large raised scars common with brown skins that could interfere with the tattoo process.
These are just some précautions to make sure your tattoo would be the best: the passion for ink knows no boundary and we hope that those 30 examples of beautiful and varied tattoos on dark skin could inspire you.