Most art is highly subjective, but it is agreed in general that in order to create art one must have been inspired, be that personal thoughts, a passing bird, or even a random stoner talking. what ever the case. Michelangelo was inspired, and thus was able to create his art, which is, again in general, thought to be fantastic and wonderful.
Angles.
wa work did michelangelo
No, he did not.
He was commissioned to do it.
Mainly for a succession of popes.
other people wanting to be artists and Michelangelo helped them with their dreams
Like all artists, Michelangelo had to create a sketch of what he was going to make before beginning an artwork.
In Rome. It was made for St Peter's.
pieta
How can we answer if you do not tell us WHAT facade? If you mean the one of San Lorenzo in Florence, Michelangelo started work on it in 1513.
His oldest surviving work is from 1491, when Michelangelo was 16.
Michelangelo did not use cartoons for this work. This was very unusual.