Those pictures do agree with what others show - that George V was crowned with the St. Edward's crown and received homage wearing the Imperial State crown. I don't know what the third picture shows, and where is the Prince of Wales?

Here is another painting which shows the Imperial State Crown for the homage:

http://en.wikipedia.org/wiki/File:The_Coronation_Ceremony_of_His_Most_Gracious_Majesty_King_George_V_in_Westminster_Abbey._22nd_June_1911_by_John_Henry_Frederick_Bacon.jpg