Because every night, on 11:34 pm, I kneel down and pray to the pixel gods, I offer them pizza and cola. If they're cheeky, they sometimes want cold ranch doritoes.
I'm good at pixel art for the same reason why everyone else that's good at something is good at the thing they're good at. I practice, I think I've been pixelling for two (?) years now. I've been making pixel art very on and off at these times, but practice is what makes me good.
I also sometimes blatantly steal the art styles of idols cough zoomo cough, but yeah.