Talent is a sum of small advantages starting from early childhood. A child that has artistically supportive parents, enough money for art supplies, maybe an art school nearby and friends who share the same interest is much more likely to become and consider themselves "talented" than a child who has very poor eyesight, who's neither parent has ever drawn anything, don't support the kid artistically and can't afford art supplies. By the time these kids know what "talent" means the advantaged kid is tens or even hundreds of hours of practice ahead of the other kid without neither of them knowing what "practice" means. On their first art class, one of the kids will already know what to do with the colored waxy sticks and produce a very nice drawing and is praised by their teacher, while the other will scratch their head and go back to playing football. Because of his positive experience with art, the advantaged kid will likely participate in creating art in the future too and will get even more ahead. The other one will think he is not talented so it's impossible for him to learn. At the age of 14, the kid that was drawing 30 minutes every couple of days will be 1277 hours ahead just because it has always been a small part of his life in one way or another.
It doesn't apply to just art, but on anything where some are seemingly naturally better at it than others. It's a snowball effect that starts right after birth and continues until you do something about it. I agree that not everyone can be the next Da Vinci but that isn't because of some genetic anomaly but because of a very special set of conditions and opportunities presented to him. In a sense, yes, the talented kid is naturally advantaged but not in an absolute sense that the word "talent" implies. It's a small but very important difference and it's a shame that such a misconception is so engrained to everyone's minds. If you believe all your life you will never be able to do something, it doesn't matter that the opportunity is sitting right in front of your nose.
I can recommend a couple of good books that expand on this. First one is "Talent is Overrated" by Geoff Colvin and the second one is "Outliers" by Malcolm Gladwell.