I think that before the fallen angels took on the curse of God they had time as angels, and naturally as angels they can turn into normal looking men. I assume that angels are taller than men and smarter and more powerful. They are taller because it takes just two to take a soul in heaven, how many people hold a coffin at a funeral. 4 to 6 perhaps even 8 dependent on size of the person. They are smarter and more powerful because they know God and everything around God automatically receives glory and splendour in its own right. It wouldnt make sense for angels to be lower than men naturally. The bible even says that angels are higher than men. It took just two to wipe out Sodom and Gomorrah.