Modeling 1: Polygons - An Introduction to Computer Graphics for Artists - page 87

6.5.7.4 Criteria

When you are fi nished with this part of the illusion project, your model should be
an excellent likeness of the reference drawing. In a professional context, a weak
likeness normally would not be used unless the object was so peripheral to a scene
that it is unlikely any viewer would notice the errors. Keep in mind that a minimum
standard of professionalism requires the ability to create a likeness.

Reference

Wu, T.-P., et al. (2010). Modeling and rendering of impossible fi gures. ACM Transactions on
Graphics, 29 (2), 1-15.