Whats this painting style called ?


I found this drawing of a set of armor and wanted to know what the painting style is called ?


Painting styles can be categorized by brushwork techniques (such as impasto, scumbling, washes, glazing, etc), or art movements (impressionism, art deco, baroque, etc), or medium (watercolor, oils, inkwash), or painting approaches (alla prima, plein air, etc), or time period/culture/subject matter (golden age of American illustration, Chinese traditional watercolor, orientalism, neo-classism, etc)

So what are you asking about specifically? Can you elaborate and be more concise?