What shade do you consider "natural" looking for someone with a slight olive complexion, not fair skinned?

The color depends on your genetics, your age and dietary habits.The most natural color is shade A2 vita with translucency, however if you want natural white shades such as A1 or B! with translucency will do, if you want it a slightly lighter color the 1M1 from Vita 3D master color shade guide, is also great, but now you are getting to white categories! 
Your cosmetic dentist can discuss all that with you!

Hi:It is difficult to give you a definite answer however, B1 or 1M1 shade in vita 3D master are both natural.Best,Dr. Maddahi

This is an often asked question. Many people want white teeth but not fake chiclet looking teeth. What looks good in my opinion and in the hands of the right dental lab technician is a blend of A1 and OM 3. Darker at the gum and lighter at the edge of the tooth. A bright white tooth that looks natural 

Hi,
You must hold up the chosen shade to your skin and eye color in natural light. This will give you the most natural tone