That crest on Monolophosaurus is open to interpretation. Some crests that will be illustrated are small things, just the ridges of the actual bone covered in skin. This is not necessarily incorrect. Then there are interpretations which extended the crest a little, such as this one, so that the skin has shown some extra personality in addition to what the bone has done on the skeleton. Considering the use of this crest was most likely for display, as is assumed in the makeup of many other crests such as those sported by Cryolophosaurus and Ceratosaurus, individuality would have been more the norm than the exception. The crest itself would have marked the species but the individual hues and bumps would have marked an individual and allowed that individual to show itself as impressive and frightening or, dare we say it, sexy.