Camille's performance style is intensely dramatic, drawing the audience into the stories and characters of the songs. Sometimes playful, sometimes with a 5 or 6 piece band, sometimes a cappella - as in her version of Brel's Amsterdam - or accompanied just by piano and taking everything down to a whisper for an emotional song like Dillie Keane's Look Mummy or Nick Cave's Little Water Song or Ship Song. Camille famously sips red wine throughout her performances, attributing this characteristic to her Irish roots.
O'Sullivan has become a popular commodity in advertising and the media, particularly in Ireland, where she advertised Hennessy Cognac under the 'Pure Character' campaign, with the tagline 'Singing in English, French and sometimes German, I like to become different characters, showing each part of myself whether vulnerable, angry, harsh or fun' and titling her 'Camille O'Sullivan - Performer'. She has appeared on the cover of Time Out London,the Sunday Independent's 'Life' Magazine twice, once for an article named 'My Fall into Decadence', and the other time,'Dublin's Dens of Desire'
She suffers from stage fright before every performance, saying "if you can use pure nerves as a fuse you can really take off like a rocket."[3]
Irish Tatler Woman of the Year Award (November 2011); nominated for Best Irish Female Music Artist Award in the Irish Music Meteor Awards (February 2009); Olivier Award for Best Entertainment (as ensemble in la Clique)(2009); Best Show Dublin Fringe Festival (2007, 2009); Spirit of the Edinburgh Fringe (2007); Best Music Brighton Festival (2005,2006); Best Artist Melbourne Theatre Awards (2005)