Another in this kind of series I’m doing on single armigers with various versions of their coats of arms. This time it is Elizabeth II, well, really the British Sovereign regardless of who it is. The first is a “small” version. You can see this one carved in stone on the facade of Buckingham Palace but it shows up most frequently on Letters Patent for a grant of arms.
The second is a kind of “middle version” and it is versions like this frequently used by the government on documents and signage.
The third is, of course, the “large” or full armorial achievement.
Next is the Royal arms as used in Scotland (same sovereign but a different version of the arms).
Fifth is the Royal arms OF Scotland as opposed to the Royal arms of the U.K. as used IN Scotland.
Finally, one used by the sovereign for the Duchy of Lancaster. (By the way even though the Queen is a woman she is still the “Duke” of Lancaster).
EXARANDORUM 
Not sure where you got your illustration for the “large” arms, but the tincture of the “George” ribbon should of course be blue not mauve.
Are you referring to the garter encircling the shield? It is blue. Perhaps the resolution of your computer screen makes it appear as a lighter shade of purple, or perhaps in my scanning the original photo the color quality suffered somewhat but it is indeed blue.