Many realistic afro textures use custom "hair shine" sliders. If your new hair looks metallic grey in-game, you likely need to install Cmar's Hair Shine Remover or adjust the settings in CAS.
Finding diverse and high-quality POC (People of Color) and afro-textured hair for The Sims 3 sims 3 poc hair
Furthermore, the existing "ethnic" hairs in the Store Content were often limited to one or two styles (like the Fast Lane Stuff pack afro). There were no baby hairs, no defined curl patterns (4A, 4B, 4C), and certainly no detailed locs. For POC simmers who wanted to see themselves or their original characters in the game, custom content wasn't a luxury; it was a necessity. Many realistic afro textures use custom "hair shine" sliders