In general, it is common in manuals to use illustrations rather than photographs since photographs often carry too much information. Illustrations express necessary information only. While it is required that they are easy-to-understand in the context of the manual, drawing everything in detail would not be suitable.  TECS has proven skills to express things to an appropriate extent, judging where to emphasize and where to omit. We can also use 3D CAD data to draw new illustrations.