The third (and for now, final) version of my Tyrannosaurus size chart. A few more minor adjustments on the form (mainly to limb proportion), and major improvements in detail (it may not be apparent on this image, but the detail is extensive enough that the individual scales now have shine and shade effects.
A few points:
This was probably the most difficult thing to research as Tyrannosauroids varied from fossil evidence suggesting fully-feathered bodies (Yutyrannus) to suggesting scaly bodies (Tarbosaurus). The only skin impressions of Tyrannosaurus came from a tiny portion of the underside of its tail- confirming that region, at least, was scaly. However, this doesn't necessarily mean the animal was fully scaled- as some dinosaurs, most notably Kulindadromeus- had fully scaly tails, but fully-feathered bodies. What became the most decisive factor was my investigation of OTHER large dinosaurs that lived in North America alongside Tyrannosaurus at roughly the same time period. The most famous cases were the dinosaur mummies (Dakota and Leonardo)- both Hadrosaurs- being entirely scaled- with other large contemporaries such as Triceratops also indicating scaly skin. Based on this, it started to become a lot more apparent that Cretaceous-era North America largely held a climate (likely warmer) warranting scaly hides on large dinosaurs (either that, or Tyrannosaurus Rex's remaining body surface was an exception). Instead I presumed that it likely evolved from a densely feathered animal that evolved for a hotter climate by shedding feather coverage and becoming more extensively scaled like the other animals. I studied a lot of reptilian skin to figure out how to make it as realistic a texture as possible, and applied many layers of adjustments over the old version. A thin layer of fuzz was added on top.
An easier part to figure out was how NOT to 'shrink-wrap' the animal. Instead I presumed it would have a thick hide with creases and folds, musculature and fat layers adding more density to the body. Like every animal alive today.
Limbs and tail
The arms have been made as muscular as the shoulder joints could possibly infer due to substantial evidence that these were extremely strong and actively used by the animal (including, according to Carpenter (2002), retaining a degree of grasping proficiency as demonstrated in other theropods). What is certain is that these arms, despite being small for their size, were NOT the scrawny twigs most people depict them as. Also, the forelimbs face inwards, as Tyrannosaurus, like most other large theropods, were unable to pronate their 'hands'.
The hind-legs are muscular- not only was Tyrannosaurus heavier than other large theropods, but it had a curiously enlarged hips for broader leg musculature.
These, along with special muscles connecting the thighs to the tail, allowed the animal to run at faster speeds than previously expected. The tail therefore is shown with extensive musculature strongly anchored to the thighs and body- as they not only helped it run, but also to keep balance and likely, to make tighter, more coordinated turns.
The eyes are based on eagle eyes; as both animals are predatory theropods, it is highly likely they would have eyes of a roughly similar shape.