dared > (The subject is indifferently "visage" or "face")
3 And in a foul black pitchy mantle clad) 4 She finds forth coming from her darksome mew,
forth coming > [coming forth] mew > den, secret place (described as a "caue" at 105.21:6)
5 Where she all day did hide her hated hue.
hue > appearance; colour (cf. 302.28:1)
6 Before the door her iron charet stood,
charet > chariot
7 Already harnessed for journey new,
journey new > (I.e. across the heavens from east to west, the nocturnal counterpart of Phoebus's traverse of the sky. A "journey" originally meant "a day's travel"; cf. 312.47:4 (1590 stanzas))
8 And coal-black steeds born of hellish brood,