It could be, but what it doesn't mean is that three separate persons, having one purpose or one mind deciding to create mankind in their image.
1. IMO, the Father/Son/Holy spirit are authorities within the person of God and the authority of the son is subordinate to that of the Father. In the same manner, He created man who within him had the authority of male and female (Eve just came from within Adam - so we can look it this way, within Adam, there was both Adam and Eve). The authority of the female is subordinate to that of the male and this is what the image of God is all about.
2. It is true also that the image He gave mankind and not other beasts. As He (God) has authority over everything, He gave mankind authority over all creation.
3. It is through this image that salvation is achieved. Male and female become one in marriage just like it was initially- female coming from male. We (mankind) proceeded from God during creation and we shall be one with Him in marriage if we truly submit to Him and obey.
Isaiah clearly brings out this image in the person of God.
Isa 9:
6For unto us a child is born,
unto us a son is given,
and the government will be upon His shoulders.
And He will be called
Wonderful Counselor, Mighty God,
Everlasting Father, Prince of Peace.
Bearing in mind that the name = authority, the child will have the following authorities:
Wonderful Counselor = Holy spirit
Everlasting Father = Father
Prince of Peace = Son
Mighty God = Mighty God
All these in one person and not three separate persons.