Again . . .
the eyes of Christ were characterized as blue-green and the color painting reflects that.
Regardless, The Risen Christ could probably have had purple eyes if He’d wished.
I have suspected for some time that Christ didn't look quite the same after the resurrection, and that this was deliberate on His part: He didn't want to be recognized by such things as the length of His nose, etc., that we seem to think so important. After all, my own outward appearance is not what it was 30 years ago, but I'm still me.
Case in point: Mary Magdalene didn't recognize Jesus in the garden until He called her name. It was the sound of His voice that she recognized, not His appearance. Same with the two disciples on the Emmaus road: it was the way He blessed the dinner that clued them in. In both cases, Jesus was recognized by personal mannerisms and attitudes that were more an essential part of His character than His outward seeming.
Of course, when He appeared to the disciples later that evening, He showed them the scars in His hands, feet, and side, which He had kept to show that this was the same body that had been on the cross. Apparently, they needed to see that to be sure.