Yes, like book or movie titles, etc., we also capitalize the titles of paintings.
Yes, the word "plaque" is not typically capitalized unless it is at the beginning of a sentence.
If you're talking about the one god, then yes. If you're talking about like the Egyptian gods, than no.
You should capitalize the word "Rugby" when referring to the sport or the specific Rugby Football Union.
No, you do not need to capitalise ornaments.
The general rule is that you capitalise only proper nouns. You do not capitalise "literature" unless the context requires it. For example: I am taking English Literature in my first year of college. I don't really like literature, but I need to fulfill my English credits. There were no other literature classes that appealed to me except English Literature.
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Yes
No.
yes
No. It's not necessary.
No.
You do, because they are proper nouns.
If a person is referring to the monarchy system of government, it isn't necessary to capitalise it. However, if the person is referring to the British Monarchy itself, then it is proper to capitalise it.
Greek Mythology or Greek Myth.
When you are referring to the planet Earth.At the beginning of a sentence.
You can capitalise it if you want.
No, there is no need to capitalise fitness in a sentence.