Every time I look at this thread title dozens of names race through my mind. I love art so much, and every single day someone's work spellbinds me, moves my emotions like an earthquake, or impresses me with technical skill. I have some long-term favorites, but I love new artists as much as the masters, and they are all from different genres.
A few to start: Caravaggio, Durer, daVinci, Chiara Bautista, Same Wolfe Connelly, Yamamoto Masao....