Standard style and usage says that you do. This has not always been the case, however. There are examples from the King James Bible where the interrogative is used in mid-sentence with no upper-case following it. If you want your writing to appear professional and competent, use the interrogative to end the sentence, and start a new one with an upper-case letter.
Your question is inconsequential, considering Bansky himself (or herself) created the intro.
Are you kidding me (question mark).
Like this. "?"
What an 'envalope' is (question mark)
If you are talking about the question marks in the pokedex, then you have to catch them, trade them, or find an action replay code. If you need more help on where to find them, go to www.serebii.net.
Yes you do.
Yes you should.
Yes, 'Is that a duck face that I see?' is a correct sentence if you capitalize the pronoun 'I', separate the word 'duck face', and be sure to put a question mark at the end (I realize that the question box wouldn't accept the question mark in the middle of the question, but it will allow you to capitalize in the middle of the question).
The pronoun "I" should always be capitalized.
Who is your favorite French artist (end with question mark).
Yes, you always capitalize "Cuban."
No. A question always has to end with a question mark.
Because that is how to punctuate a question properly.
"Who is your favourite French artist?" (Note, the quotation marks are there as without them, the question mark flags the answer as being a question - which is not allowed in Answers.)
The explanation point is always before the question mark.
If you have a Latin (make sure you always capitalize Latin) set then you always read/write in Latin.
No, hypotheses do not always end with a question mark. A hypothesis is a statement that predicts the outcome of an experiment or research study and is typically written as a declarative statement, not as a question.