Nice!
For African skin tones, I follow the reverse sequence that I follow for Caucasians. For Caucasian skin, I lay down my light color, my base skin tone, then add shadows, and highlights. For African, I lay down the darker color as my base, and then add my lighter colors-like on the face, the cheekbones, the forehead, bridge of the nose, etc. No right or wrong, just what I stumbled upon.