Roy finds that painting with watercolour both in and away from the studio offers a great amount of freedom. By its very nature watercolours allows a faster method of working permitting an instant and direct interpretation of the subject matter. Among other qualities he values are , the regard one needs to have with the care and displacement of light and white areas and the pure interaction of flowing colour as opposed to the firm crispness of layered flat washes. Quite markedly his approach demonstrates a modification and reduction of the object into only those elements which carry its essence and significance

Roy's main concern when painting in watercolour is with the expression of light, dark, and colour as areas and movements. His direct active explanation in paint remains constant and distinctive whether the subject matter is still-life, interior, landscape or figure. He feels strongly about watercolour painting as an immediate statement of seeing and painting uncompromisingly showing the engagement of the painter with the subject and process.