How to draw a Trumpet with Albrecht Duerer Artists‘ Watercolour Pencils The coloured surface can be transformed with only a few fine or broad brush strokes to reveal the full and unique power of the colours. The coloured surface can be transformed with only a few fine or broad brush strokes to reveal the full and unique power of the colours. How to draw a Trumpet with Albrecht Duerer Artists‘ Watercolour Pencils