One might expect the onlookers to represent other members of the Athenian youths and maidens sent for sacrifice to the Minotaur. However, the presence of beards on the men suggests that they are rather "simply part of the formal design." See no. 247 in Carpenter, Art and Myth in Ancient Greece.
The Painter of Louvre F6 rarely depicts mythological subjects. His animals are very close to Lydos. For other hydriae by the painter with similar compositions on the shoulders see Beazley, Attic Black-figure Vase-painters, pp. 123-124, nos. 2, 8, 9 and 13.