Question: What was Hulsker's opinion of Sien?
About the article "Sien (Van Gogh series)", section "Reaction to his relationship with Sien".

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At the end of January 1882, on his own account, van Gogh met a homeless, pregnant, prostitute named Clasina (Sien) Maria Hoornik who had been deserted by the father of the child she was carrying.
The exact date of this meeting is not known beyond van Gogh's dating of it in a letter to Theo written in May.
However another letter written mid-January mentions he was negotiating modelling with "a mother with a little child" and it does seem plausible this was Sien.
It has also been suggested that the woman he "found" following his humiliating rejection by his cousin Kee Vos, as described in a letter to Theo around 23 December the preceding year and immediately before his final estrangement from his father that Christmas Day, was in fact Sien, although there is no direct evidence for the surmise.
If so, he cannot nevertheless be the father of the child she was carrying because the dates do not fit.
Sien was born in 1850, the eldest of ten children of Pieter Hoornik, a porter in the poor district of the Geest, and his wife.
Pieter died in 1875.
To provide for the family Sien and her mother worked as seamstresses and cleaned homes.
Their earnings were supplemented by what Sien's brother, Pieter, could provide from the income of his chair-making business.
The family often relied upon public assistance.
For a time Sien and some of her siblings lived at a Catholic orphanage, relying on assistance from the public soup kitchen and church charities.
So meager were her earnings, she turned to prostitution for a better income.
At the age of 32, the unmarried Sien had given birth to four children, two of whom lived: Maria Wilhelmina born about 1877 and Willem born July, 1882.
Sien experienced poor health due to the post-operative effects of earlier surgeries, illness and venereal disease, which she seems to have passed to van Gogh who was hospitalized in June 1882 for gonorrhea.
Sien posed for van Gogh throughout the winter.
In exchange van Gogh provided Sien and her daughter a place to live and food to eat.
Sien was ill when he met her and he did what he could to nurse her back to health.
Van Gogh considered marrying Sien to take care of her and keep her off the streets.
He envisioned a life where Sien would be his helpmate, helping him further his artistic career.
Sien wanted to be married to him, too, even though he was poor.
His family, including his brother and supporter Theo, were against the relationship and his hope for continued support was doubtful.
In June 1882, van Gogh was hospitalized for gonorrhea.
Disobeying doctor's orders, he left the hospital July 1 to visit Sien in Leiden where she had just given birth to a baby boy.
Van Gogh moved to a larger studio next door with Sien and her two children.
Sien required an extended period of recovery from a difficult pregnancy and delivery.
The baby boy, though, seemed to bring a lot of happiness to van Gogh.
He explained that while he endeavored to go deeper as an artist, he was also looking to do so as a man. 
  "Als Ot en Sien", ("like Ot and Sien"): childishly simple.
"Uit de tijd van Ot en Sien", ("From the time of Ot and Sien"): from the good old days, from olden days.  
Sien is a village in the Toma Department in the province of Nayala in Burkina Faso.
Sien has a population of 707.  
Red Sien () is a 1975 Dutch comedy film directed by Frans Weisz, produced by Rob du Mée.
The story is based on the play with the same name, created by Marius Spree at the start of the 20th century.
Beppie Nooij jr. played the role of Rooie Sien ("Red Sien") almost 1500 times on the stage.
In the film Willeke Alberti plays the role of the young Sien, while Nooij moved on the role of Sien's mother.
The film was entered into the 9th Moscow International Film Festival. 
"Ot" and "Sien" are the main characters in a series of Dutch children's tales that were very popular in the first half of the twentieth century.
The first series titled "Dicht bij Huis" ("Close to home"), appeared in 1902.
The second series "Nog bij Moeder" ("Still with mother"), followed in 1904.
De author of the stories was .
However, he acted on the inspiration of Jan Ligthart, who had the intention to expose young people to what he considered a healthy daily family life.
The illustrations were made by .
After WWII the stories of Ot and Sien gradually went out of fashion and they were often ridiculed for the unrealistic picture they gave of life in the province.
A century after their appearance there is a revival in the interest for the publications and in 2004 an exposition was held, focusing mostly on the artwork by Jetses.