Dickens portrayal of Mr. Vholes is a blatant criticism on lawyers. At the start he seems like a stark contrast to Richard. He has a family and seems to be healthily removed from his job. But a closer reading will reveal the indictment Dickens has made of lawyers: they are basically cannibals. Esthers physical description of him indicates this.
There was nothing so remarkable in him as a lifeless manner, and a slow fixed manner he had a way of looking at Richard.
Later on when Richard and Vholes are leaving she makes this remark
Richard, all flush and fire and laughter, with the reins in his hand; Mr. Vholes, quite still, black-gloved, and buttoned up, looking at him as if he were looking at his prey and charming it.
As the reader reaches the last few lines they understand Mr. Vholes characteristic and know the case will never end happily for Richard. Vholes is there to exploit and suck all of the money out of people like Richard Carstone.