I had a similar situation with a client and on the second session I switched from eternal black to silverback and used long taper #12's for lining and #12's for shading and her skin took the color much better. Also I did hang the needles out a bit more and slowed down and took time to pay attention to the saturation and my strech. All in all I think my strech could have been better to begin with and the long taper liners in my opinion worked best for her skin type.

For reference my client was a 20yr old very pail skinned young lady. But I did notice her skin was thick and with my normal setup I was getting dull lines.