A picture paints a thousand words -- do I capitalize it like a book title?

[Capi]

English Language Tests, Intermediate level

ESL/EFL Test #406 "English Slang Idioms (141)", question 1

"I went to the new amusement park and in my opinion, it's nothing to ......... home about. The rides were very small and expensive, as was everything else. I wouldn't recommend going," Billy told Lewis.

(a) write
(b) mail
(c) go
(d) shell

English Language Tests, Intermediate level

ESL/EFL Test #406 "English Slang Idioms (141)", answer 1

"I went to the new amusement park and in my opinion, it's nothing to write home about. The rides were very small and expensive, as was everything else. I wouldn't recommend going," Billy told Lewis.

Correct answer: (a) write
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a picture paints a thousand words do I capitalize it like a book title?

[Mister Micawber]

No, there is no need to capitalize a proverb. However, if it stands alone or begins a sentence, the first word (here, 'A') must be capitalized, of course.
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Native English teacher at Mister Micawber's