The answers to those questions are important so as to where you take your art.Those questions are ones that I'm going to have to live.
If you are a pioneer, just do you, believe in yourself and go for it. If you are a follower try to have a nose for the newest trends, try to catch trends early and milk them.
If you make music for you, what does it matter what anybody else thinks?
If you make it for others then their opinion matters. But also know that you can never please everybody, its impossible, you will realise this when you have tracks both equally loved and hated, it happens, thats life. You cant force people to like your art, but a true artist will hone his craft until those that dissed you show you respect.
The best advice for any artist, is draw from your inspirations, there is nothing new under the sun, it is merely reinterpretations of that which came before, but for your own soul and sense of achievement, develop your own sound and be known for your own sound, not being known for sounding like somebody else.
You could always do a bit of both, try to satisfy your own soul as well as the demands of others to make money to pay for the soul satisfaction part.