I don't think there's a recipe, or a color chart like the paint store, that you can reference. here's a question: if two people of different skin pigmentation love each other and decide to bring a baby into the world, who cares what the skin color is?
The answer is a mistake. A pretty redheaded girl like yourself would be doing a disservice to your Irish roots by even thinking about dating any non white person. Think about your parents.and grandparents. Have some pride in who you are and where you came from.