Building digital props for visual reference isn't just extremely useful for an artist - it is also an incredibly challenging and fun task. There are so many considerations beyond simply producing a digital asset as reference for the creation of an illustration, many of which depend on how the artist wants to use his or her digital pieces for reference. Aspects such as composition, color, and light (among others) come into play. For instance: A drape blowing in the wind might look very exciting and dynamic from one angle however, from a different angle - and one that is called for by the demands of the story being illustrated - the digitally-built drape might not look quite as cool and so a more dynamic drape model must then be generated and positioned on set. Creating artwork by combining classical techniques with 21st century tools certainly has its benefits but don't be fooled... it is also a vastly complex puzzle with which the digital artist must wrestle!