I vote for the wash but it's easy to overdo it, especially on light colored cars. Marco Cruz posted a tutorial somewhere on here describing his technique of applying the wash before color coats that I have found very effective. It still accents the panel lines but tones it down to a scale (to my eye) appearance. Or you can use a darker mix of the body color. I usually only accent the panels that open (doors, trunklids). For example the line on the rocker panel below the forward door line on your example is painted on the 1:1 and barely noticeable. The same with the cowl vent panel (again to my eye). None of this is meant as downgrading your build Tulio, I think your work is outstanding!
Bill beat me to it about Marco's technique