Adjusting the color in Photoshop or using those "tone" MATs that come with V3's texture pack don't produce realistic results, IME. Dark-skinned people aren't just Photoshop-adjusted light-skinned people.

Unfortunately, a lot of the African American textures sold are just Caucasian textures darkened in Photoshop. You can usually see this on the hands and feet. Dark-skinned people have pale palms and soles, but many of the African textures sold have palms and soles as dark as the rest of the skin. It's gotten to the point that I don't buy dark-skinned textures unless the promo images show the palms and soles, so I can see if they got it right.