Develop your sketch in greyscale

After presenting your three sketches to the art director you’ll either have the go-ahead for one of them or you’ll be asked to make changes. Either way, you’ll start to work up the final sketch in detail, usually only in greyscale, and usually using Photoshop. I do a large part of my painting in greyscale because it enables me to see the value and shape aspects of the composition more clearly and without the distraction of colour.