It would be better if you showed us what you got, and told exactly what it is that you’re missing.
But to recreate the images in your OP, you can try following the below:
With MR, have final gather turned on, and just place an mr area spotlight to the side and above, set it to have mr area shadows and make it pretty big in size (area light parameters). You might want to add a few of these lights around with varying intensity. Keep it simple though, two or three is probably enough. Google and learn 3-point lighting. The shader might look better with some SSS (sub-surface scattering), google how to use that for mental ray.
A better light to use might be a portal light, with a custom source being a kelvin temperature map set to neutral (6500k) or slightly warmer like 6000K for the key light, and slightly colder like 7000K for the rim light.