3:17 PM PT -- TMZ Sports spoke with Ortega Rojas about the ink ... and he tells us the tat was Urias' dad's first EVER!!
Ortega Rojas says the art took nine hours in total to complete ... and it meant a lot to Urias' dad, who wanted the piece to be a symbol of the long and successful journey it took to get Julio from a youngster to World Series champ.
Julio Urias' dad just made sure he'll NEVER forget his son's World Series win ... the star pitcher's pops just commemorated the Dodgers' title with a HUGE tat -- and it's awesome!
The artist who did the work -- Andres Ortega Rojas -- revealed the piece Sunday night ... showing off the new, incredible ink that runs from the top of Julio's dad's shoulder to just above his elbow.
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The artwork features 24-year-old Julio celebrating inside the World Series trophy ... with "World Series Champions" inscribed at the bottom.
Of course, the depiction of Julio is now a famous image ... it's the pose he struck after closing out the Tampa Bay Rays in the 9th inning of Game 6 back in October.