 On 28 October 1883 he became a founding member of Les XX, a group of twenty Belgian painters, designers and sculptors, who rebelled against the prevailing artistic standards and outmoded academism.He was impressed by the works of Georges Seurat and Paul Signac and changed his own painting style from a more realistic approach into a pointillistic style.In the following years, Finch became one of the leading representatives of his style in Belgium, along with Théo van Rysselberghe.