She has to look good, and be confident in her looks.  She can be blonde, burnette, ginger (As you have it)...straight hair, curly hair, whatever...as long as she thinks she sexy, it goes a long way.  I'd rather date a bigger woman who was really confident than an extremely fit one who had esteem issues.  I am usually, however, drawn to large bossomed nice round arsed girls, who like to smile.