What did the greek god Nike look like?

Nike was a goddess.

Nike was depicted in ancient Greek vase painting with a variety of attributes including a wreath or sash to crown a victor, an oinochoe and phiale (bowl and cup) for libations, a thymiaterion (incense burner), an altar, and a lyre for the celebration of victory in song.

In scenes of the Gigantomachia (War of the Giants) she often appears driving the chariot of Zeus. In mosaic art and coins Nike isoften shown holding a palm branch as a symbol of victory.