In Paradise Lost, Hell and Heaven are symbols of evil and good; wickedness and innocence; stubbornness and repentance; punishment and reward.
In Book 1 of Paradise Lost, Milton gives Satan's character epic attributes such as great leader, brave general, rebel and indomitable hero.
T.S. Eliot is the one who criticised him the most due to artificiality and fabrication in Milton’s grand style in Paradise Lost.
Paradise Lost is classical epic as it is a long narrative poem, has grand style, heroic figures, may discuss grand themes and lofty settings.
Certain elements of “Paradise Lost” are evident that Milton was a poet of renaissance and the poem falls in the class of renaissance epic.