Consider a few verses about God making the human race:
Genesis 1: 27 “So God created man in his own image, in the image of God he created him; male and female he created them.”
Matthew 19:4&5 Jesus answered, “Have you not read that from the beginning the Creator ‘made them male and female’… and the two will become one flesh’?”
Genesis 5:1 (NIV) “When God created mankind, he made them in the likeness of God. 2 He created them male and female and blessed them. And he named them “Mankind” when they were created.”
The reference to being made in the image of God is always coupled with them being made male and female. I don’t think either was made in the image of God, but rather THEY were made in the image of God. This is why the two are meant to become one- we complete the image together.
Which is the image- the portrait or the profile? A front facing portrait and a side profile of the same person are very different. Think about this- if you were an alien life form from a distant world- say you were a plant- and you were given two pictures of the same person- one front facing and the other the profile- would you even know they were the same species?
One has two eyes, two ears, and a mouth and a nose in the middle of its face. The other has one eye, one ear, and a mouth and a nose on the side of its head.
Both together give a better sense of the real subject. Women are like men the way a portrait and a profile are alike. Neither gives a full impression of what the subject looks like. Together they give more of a full picture than either could alone. This is why God made men and women very similar, and yet very different. Only together can we complete the picture. This is the foundation for marriage, and the equality of men and women.