Below are Teresas in my collection:
Teresa in the 1990s: Wet and Wild, Walmart Shopping Time, Perfect Pink, and Butterfly Art Teresa. Most Teresas had golden or light brown complexions with dark or black hair. Her eye color could be blue as in Walmart Shopping Time Teresa or hazel/green as in Butterfly Art Teresa, but usually Teresa's eye color was brown.
Moving forward ten years. Mattel now provides hair and complexion variety to Teresa as shown in the Fashion Fever line dolls. Teresas can now have blond hair and fair/light complexions as well as blue eyes.
More Teresas with different face sculpts - including two new ones: