Thanks everyone for kind words and advice! Typo and lower hull shading corrected.
@oberon_706: Looking at her hull, there seems to be very little flare; her lines look relatively straight from stem to stern. I figured no above water hull shading would be necessary.
As Krakatoa pointed out, Queen Mary was obviously painted in a new kind of livery some time in 1916 that did not become common until much later; can't say if this was the colour scheme she took to her grave, however. I've provided it below for comparision: