A few years ago, I was contracted to provide a book cover design and
several interior illustrations for a book about the dyeing and
restoration process for fabrics, leather and suede. The author left the
design concept up to me, and once I submitted a sketch, he would approve
it or suggest changes. I read the manuscript and decided that since the
title was very straightforward, I would make a triptych-style
illustration (a triptych is composed of three panels that either fit
together to make a larger piece, or that coordinate--if two are used, it
is called a diptych). One panel would show the science behind the
process, as many dyes are mixed according to a specific recipe or
chemical process; one would show examples of materials mentioned in the
title--I used a satiny fabric, a shiny black leather, and a muted brown
suede for maximum contrast among the three. The final panel would show
someone carefully redyeing a piece of clothing.
I produced a "comp sketch" for the client. "Comp" is short for
"comprehensive". A comprehensive sketch differs greatly from, say, a
thumbnail sketch, which is a small, loose rendering designed only to
communicate a simple concept and perhaps to figure out compositional
elements. A comp sketch is comprehensive--that is to say, it is done
full size, with the final composition and colors and rendered fully. The
only difference between the comprehensive sketch and the finished art,
other than any changes requested by the client, might be the medium.
Usually "quicker" graphic media such as ink, marker and colored pencil
are used, whereas finished art is more likely to be painted (this is
about art done by hand, not on the computer, obviously). I made a line
drawing in ink on board, and then I photocopied the line drawing and
colored it with colored pencils. This way, if the client wanted color
changes, it would be easy enough to make another photocopy of the
original drawing and submit the new color scheme.
Above photo is my first comp sketch. Click to enlarge for detail.
Here's Part Two
http://allsortsartbyali.blogspot.com/2015/03/book-cover-design-part-two-mockup.html