I don't know if you know this site:
WWI Aviation Pictorial History An Illustrated History of World War 1 Aviation
The site is the repository of a lot of great wwi aircraft profiles.
The guy there W. Boucher make a great work his has a lot of profiles and you can see then by year, by country, etc.
He's asking for help to keep the site free of ads so I tough some of us interested in aviation can help.
Some examples:
Or least go I see the site and the blog:
WWI Aviation Illustration
Is great for any aviation enthusiast.
Regards
Alcides