@Brian2170 I would like to add that the BOAC, and Negus 747s were white, while the Landor is not supposed to be the same color, it is a grayish beige color, but in your drawings, you have all three 747s the same fuselage color.
I did the original BA 747's, and Brian2170 merely copy-pasted the liveries from older models onto -400 (and changed the registrations etc.).
The white and/or "whatever white-ish color there could be instead on any of the liveries" looks effectively "close enough" to me
And if You want to start discussion on minutiae details of colours and shades used for liveries and camouflages in FD... then I'm afraid that some 90% of those used in all FD works so far are - to varying degrees - actually off.