text:  Most critics focused on Heads I and VI , remarking favourably on the progression between the two . While some found the inherent violence of the paintings <unk> , <unk> was a skilled publicist and turned the bad press into notoriety , and brought <unk> 's work to national attention . <unk> notes that the exhibition showed <unk> no longer needed <unk> material to make an impact , and was now capable of creating an intense emotional response through more subtle means , and had found a way of presenting the human condition in the way he had sought , by presenting his sitter " in a <unk> setting , a cage or [ behind ] a parted <unk> ... the rest , the most essential , lay in the manipulation of the infinitely <unk> medium of oil paint " . After the showing <unk> gradually became " less the <unk> with an occasional image of <unk> <unk> and more a force to be <unk> with on the contemporary scene " . His reputation and the value of his panels rose dramatically , and after the showing he was sought after by European , American and African collectors and galleries , commanding prices as high as £ 400 for single works , unusual for a contemporary British artist of the time . 
  