Importance of poetic devices in Shelley's poems?

One main theme of Shelley’ poetry is what critics (not the poets themselves) have called Romanticism. The literary movement known as Romanticism generally runs between 1789-1822, corresponding to the dawn of the French Revolution and the deaths of Keats (in 1821) and Shelley. Literary scholars separate the Romantics into two camps, headed by three major poets in each. William Blake, William Wordsworth, and Samuel Taylor Coleridge heralded the first group of Romantics, while the second group was led by Lord Byron, Percy Shelley, and John Keats. All of them tend to use nature as expression, personification, and radical thought to provoke a sense of revolution. Yet, critics persuasively argue that the second group resembled the first in few ways. Even the poets themselves saw important differences; for instance, Shelley particularly mocked earlier works of William Wordsworth. Shelley and Byron would blame their elder contemporaries for being “all talk and no action,” accusing them of abating their counter-cultural spirit as they aged.