How does Ligeia Siren elucidate its Pre-Raphaelite Brotherhood and influence?
The Pre-Raphaelite Brotherhood were a group of artists with core values wishing the return to artistic styles and norms to those of artists existing before Raphael, who they believed had led the art world astray. They believed that "artifice was to be abandoned in favour of an earnest truthfulness, a blurring of the boundaries between art and life, a kind of super realism which might embody a higher truth." The brotherhood often criticized modern art as  overly dramatic and "sloshy", which they defined as anything "lax or scamped in the process", they contributed these terms to a largely popular artist at the time Sir Joshua Reynolds whom they loving called 'Sir Sloshua'. Many of the values of the brotherhood stayed with Rossetti for the rest of his creative career, even as he would separate from them.
Many of Rossetti's later works, like Ligeia Siren, are often contributed to the Pre-Raphaelite Brotherhood though he was no longer with the group by this time. His later works were often criticized by fellow Pre-Raphaelite brothers as representative of Rossetti's own desires for the opposite sex, existing only as beauty without a purpose, pictures lacking any moral or valuable narrative. Rossetti continued to develop his own deeply personal style that would be considered it a degradation of art. Member of the Pre-Raphaelite Brotherhood would try to distinguish themselves from this work by designating the period after with which Rossetti participated in the fraternity as the (late) Pre-Raphaelite Brotherhood. Meanwhile, Rossetti formed a new group of his own that they lightly called the 'second generation' of Pre-Raphaelitism.
Raphael Pre-Raphaelite Brotherhood Joshua Reynolds Sir Joshua Reynolds