Elizabeth Eleanor Siddal was a model, painter, and poet. She was the partner and eventual wife of Christina Rossetti’s brother, Dante Gabriel Rossetti, who was a famed painter of his time. She started off life as a poor woman who worked in a milner’s shop until Walter Howell Deverell discovered her beauty. He called her “...a queen, magnificently tall” (BBC). She began modeling for famous painters and became famous for modeling for Sir John Everett Millias’ painting, “Ophelia” in 1851. She found full time modeling work and was able to leave the shop. In 1854 Dante Gabriel Rossetti began teaching her. This is when their tortured love affair began. In 1857, after saving money, she decided to escape from her life with Rossetti, so she ran away to Sheffield, England. Between Rossetti being unfaithful and Siddal being addicted to laudanum (opium tincture), their relationship was doomed from the beginning. When her health started to fail in 1860, Rossetti decided he would wed Siddal. She quickly realized she was pregnant but unfortunately had a stillborn daughter due to her drug addiction. When she got pregnant the second time, she decided she could not bear another loss of a child and committed suicide by overdose. It is said that throughout Rossetti and Siddal’s relationship, he painted her over a thousand times, which is what inspired the poem "In an Artist's Studio" to be written by Christina Rosetti. After Christina’s death, her brother William Michael released this unpublished poem and this note accompanied. “‘The reference is apparently to our brother’s [Dante Gabriel Rossetti] studio, and to his constantly-repeated heads of the lady whom he afterwards married, Miss Siddal” (British Library). 

Other readings I suggest: 

The Tragedy of Art’s Greatest Supermodel

https://www.bbc.com/culture/article/20200103-the-tragedy-of-arts-greates...

The whole website of LizzieSiddal.com!

http://lizziesiddal.com/portal/

“Behind Those Screens”-- Bringing Women Forth: Christina Rossetti and Elizabeth Siddal

https://revista-anglo-saxonica.org/articles/10.5334/as.15#2-beautiful-co...

Sources Sited:

“Notebook of Christina Rossetti (two of six), 18 December 1856-29 June 1858.” British Library. Notebook of Christina Rossetti (two of six), 18 December 1856-29 June 1858 | The British Library (bl.uk). Accessed 18 September 2023. 

“The tragedy of art’s greatest supermodel.” BBC. The tragedy of art’s greatest supermodel - BBC Culture. Accessed 18 September 2023.