Of Whose Image Is Lucifer?

Man was made in the image of God, so how about angels?  Whose image are they?  What do they look like? 

Lucifer was an angel, as was his army who were defeated and cast to live on Earth.  

Pictures of angels and demons I've seen usually depicted a human form.  Is this how people saw them, even back at the beginning of mankind?  If so, then angels, too, were made in the image of God.  Even cute little cherubs have human looking features.   All angels have individual purposes, as do people; but most people don't think, much less act, about their purpose.  

So Lucifer and his kind are angels, and look like God's angels, who resemble people, who was made in God's image.    

Imagine that.