But David is why you are going there so let's cut to the chase. We were fortunate to have a tour guide and learned a lot about how the statue was built.
Notice David's weight is shifted to one leg and that is significant: the marble is strongest with a "brace" like the leg and the marble wood piece behind that dominant leg, necessary to support the weight of that massive marble piece.
Notice David's scornful brow and how his head is facing left towards Rome (which is an intentional affront to the Medici family who relocated to Rome from Florence), and a further statement by the community that they will be in control of their city and their affairs, not Rome. A politcal statement for the times, to be sure.
Take some time to appreciate the fine muscular artistry and feel the energy in that hand holding the shot while the sling is cast over David's shoulder.
There are several other marble pieces, sort of works in progress, where you can see the human forms escaping the confines of the marble and it almost looks like they are emerging from the stone, intact and whole, only stepping out of the rock.
Michelangelo was a teen ager when he insulted the work of an older teen apprentice and got a smack in the nose for a reply. His nose broke and you'll see a self-portrait of a flat-nosed artist who was to bear that disfigurement his whole life. So now you know why he looks like that.