Artizan Designs has a page with very good painting guides for a wide variety of World War II Uniforms.
painting guide
Armies of Finland 1783 – 1811
The New York Public Library has a large collection of color plates of the armies of Finland in the 18th and early 19th centuries.
Uniforms of Norway and Sweden 1500 – 1909
Here’s a large selection of color plates of the uniforms of Norway and Sweden from 1500 – 1909.
Uniforms of Egypt 1820 – 1898
The New York Public Library has an online collection of color plates of Egyptian uniforms for the period 1820 – 1898. This should be a great reference for people interested in the Sudan and other North African campaigns in which Egyptians participated.
German Military Uniforms 1740 – 1900
The New York Public Library’s Digital Gallery has color plates of German military uniforms dating from 1740 – 1900. These include the uniforms of German states such as Anhalt, Bavaria, Saxony, Hamburg, Hessen, Prussia, Nurnburg, Saxe-Weimar, Wurtemburg, and Westphalia.