[ The tough one is pictures trumps 3view and WW1 pictures are terrible..[/QUOTE]
If competing in a U.S Scale Masters qualifier,regarding WWI models - you may use "published" artwork such as plastic model box-top art to document for - Color & Markings
Also, you may use any color artwork or photos of planes in the particular squadron.
eg; lets say that you can obtain a color photo from the National Air & Space Museum to show the squadron's colors but the photo does not show your particular prototype,
that is acceptable. When proving the squadron's color & markings (unit codes) you don't have to show a color photo of your model's full-scale counterpart. But to prove
the personal markings such as nose art, for that you do need something to show colors. That can be difficult.
I know of one example of a Fokker DVIII where the builder uses all B&W photos but then also includes one artist color-plate to prove colors. This builder competes & wins in
TEAM Scale quite often. Documenting a WWI or any pre 1935 plane is very challenging but it can be done effectively. See sample picture of Wayne Frederick's Fokker.
Wayne consistantly earns a 98 or higher staic scores.