This artwork, in which the slogan “Only in death does duty end” features prominently, is called Sister Hospitaller and is by artist PvtSerrano. The artist introduced it as “a little more Warhammer stuff”, which somewhat cryptic note can be unpacked by reference to the Warhammer 40k wiki page on the Orders Hospitalar. In the Warhammer 40k game universe, “The Orders Hospitaller is a non-militant Order of the Adepta Sororitas dedicated to healing and the provision of medical care for all the citizens of the Imperium.”
Image provenance by Bacchus at Erosblog.