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That is called realism.
ecological succession
The contact zone is called a cold front.
Primary succession.
They are called secondary colours
Artwork
All people in England are called subjects of the King or Queen.
Scrimshaw
Oh yes.
fetch boy fetch
sample
Without providing more information (subjects in school, subjects of a kingdom, subjects as parts of speech etc.), subjects also fit into catagories.
volumn
It depends on what media the artwork is. For two dimensional and digital pieces (and maybe three dimensional, I'm not 100% sure), there is a website called deviantART where you can sell your artwork as posters. You can also auction your artwork on eBay if you request a reasonable price.
The Horizon line
an occupying force is a force that occupies something. forces that are occupied by this something are called occupied forces.
It was called Operation Overlord