Lunar Models' resin kit is based on the famous mural in Chicago's Field
Museum of Natural History, painted in the 1930s by Charles R. Knight.
Knight's original painting
Both Dinosaurs were re-worked slightly. The Triceratops' frill spikes
were rounded over and its mouth, which was way too wide was shortened.
The Tyrannosaurus was re-worked even more. The head was tilted up slightly
and the snout, which was shaped like an old shoe, was made narrower and
re-sculpted with epoxy putty to more closely resemble T-Rex depictions
in other Knight paintings
The skin was originally wrinkled like an elephant's, similar to the Triceratops. The wrinkles were all filled in and smoothed out with putty. The skin was then re-textured with primer to more closely resemble the beast in the painting.