"Ruby’s Room, at The Holburne Museum in Bath, is a newly commissioned body of work made in response to a miniature eye portrait from 1810, currently on display there.  The centrepiece of von Zwehl’s elegant installation is a beautifully illuminated glass cabinet that contains two specially-produced eye portraits, one of her daughter Ruby’s eye, the other of her husband David’s, each set into its own unique piece of jewellery, created by jeweller Laura Lee.  As well as these exquisite works, the exhibition consists of just three small photographs; depictions of the artist or her daughter, their miniature presence magnified by crisp pools of spotlight picking them out of the darkened space ... in relation to subject matter, she has talked about her growing instinct to work not with randomly encountered strangers to whom she has no emotional connection, but instead with people close to her; her family, and a small group of close friends. 

[The exhibition] beautifully conveys some of the tensions that can arise in any type of relationship, whether between artist and sitter, or here, in an extension of that, mother and daughter.  ‘The more I wanted, the more she resisted’ Bettina has said, on remembering back to the negotiations with Ruby when asking her to sit for yet another portrait.  In this way, Ruby’s Room represents a playing out of that relationship, an acknowledgment of the intense focus placed onto the subject of a photograph, exacerbated by the fact that here, the subject is the artist’s own daughter.

-  Extract from a review by Sophy Rickett, Photomonitor