I did a search I found this
http://www.barbarahepworth.org.uk/sculptures/1932/two-heads/
Two Heads, Cumberland alabaster, 1932 (BH 38), Pier Art Centre, Stromness, Orkney
Two Heads
It states it was made from Cumberland alabaster
Finished 1932
I think the location it is located is Pier Art Centre, Stromness, Orkney
Here is a biography
http://www.barbarahepworth.org.uk/biography/
Here is more information
http://www.tate.org.uk/visit/tate-st-ives/barbara-hepworth-museum-and-sculpture-garden
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What type of information do you need?
The sculpture has less detail than
http://www.barbarahepworth.org.uk/sculptures/1931/head/
This figure of a head is more stylized
http://www.barbarahepworth.org.uk/sculptures/1972/head-ra-1/
You may want to note when they were done how the style changed over the years
You could look at different reviews
http://news.bbc.co.uk/2/hi/programmes/newsnight/review/2956964.stm
http://www.britannica.com/EBchecked/topic/262392/Dame-Barbara-Hepworth
You could talk about a woman doing sculpture in a predominately male profession