No you do not capitalize artist in a sentence
Unless it is the first word of the sentence, artists remain in lower case
Who is your favorite French artist (end with question mark).
No, you do not capitalize "first birthday" in a sentence.
You only capitalize 'deceased' if it is at the start of a sentence.
You should not capitalize a sentence fragment following a colon.
no
Who is your favorite French artist (end with question mark).
At the beginning of the sentence and when it forms part of the proper noun. Example: Great Summer Artist Workshop
Mexican would be since it is derived from Mexico, a proper name. Artist would not be capitalised.
You do not capitalize chickenpox in a sentence. The exception is if the word is the first in the sentence.
No, you do not capitalize "first birthday" in a sentence.
Yes, "nuns" should be capitalized in a sentence as it is a proper noun referring to a specific group of people who belong to a religious order.
You only capitalize 'deceased' if it is at the start of a sentence.
No, you do not capitalize marine biologist in a sentence. (Unless marine is in the beginning of the sentence)
Yes, you always capitalize a day of the week.
It depends on where you put it in a sentence. Of coarse in the beginning of a sentence you capitalize space but by it's self no you don't capitalize.
You should not capitalize a sentence fragment following a colon.
no or at least not any more than i capitalize the word sentence in a paragraph