 In mid @-@ 1833 Etty began a portrait of the daughters of Charles Watkin Williams @-@ Wynn , the long @-@ serving Conservative Member of Parliament for Montgomeryshire , shown Preparing for a Fancy Dress Ball . Etty was then little @-@ known for portraits , but had recently completed Elizabeth Potts , a portrait of the daughter of a family friend , which although poorly received by some critics was technically highly accomplished . He said at the time that he hoped his portrait of the Williams @-@ Wynn children would be " one of my best " . 
