Deshaun Watson just made a massive commitment to his girlfriend ... getting a huge image of her face tattooed on his left shoulder blade.
The Cleveland Browns superstar hit up Onder Ink's Andres Ortega in Arizona this month to get the work done ... and you can see, the Jilly Anais pic came out awesome, but it was just one part of a tat the now covers the entirety of the 6-foot-2 signal-caller's back.