Angels are spirit beings (Hebrews 1:14), so they do not have any essential physical form. But angels do have the ability to appear in human form. When angels appeared to humans in the Bible, they resembled normal males. In Genesis 18:1-19, God and two angels appeared as men and actually ate a meal with Abraham. Angels appear as men many times throughout the Bible (Joshua 5:13-14; Mark 16:5), and they never appear in the likeness of women.
Other times, angels appeared not as humans, but as something other-worldly, and their appearance was terrifying to those who encountered them. Often, the first words from these angels were “do not be afraid,” because extreme fear was such a common reaction. The keepers of Jesus’ tomb became as dead men when they saw the angel of the Lord (Matthew 28:4). The shepherds in the fields in Luke 2 were “sore afraid” when the angel of the Lord appeared and the glory of the Lord shone around them.
As for physical characteristics, angels are sometimes described as winged. The images of cherubim on the ark of the covenant had wings that covered the mercy seat (Exodus 25:20). Isaiah saw winged seraphim in his vision of the throne of heaven, each one having six wings (Isaiah 6:2). Ezekiel, too, saw visions of winged angels. Isaiah 6:1-2 depicts angels having human features—voices, faces and feet. Angel voices are heard singing and praising God in several other passages. The angel at Jesus’ tomb is described as having a brilliant appearance: “His countenance was like lightning, and his raiment white as snow” (Matthew 28:3).
Whatever appearance angels take on, there is reason to believe they are incredibly beautiful. Ezekiel tells us that Lucifer was “lifted up” in pride over his beauty. In addition, beings such as angels, who are continually in the presence of God, would be expected to have extraordinary beauty because God’s glory is reflected upon all that is around Him.