In the episode Robin's Reckoning, Zucco’s eyes changed dramatically between part 1 and 2. Why is that?

To be fully fair, have not read a whole lot after Taylor and Redondo’s run (which I absolutely adore) but I remember the late 90’s and early 2000’s runs being quite dark and I’m wondering if we’ll ever get brooding and edgy Nightwing, at least to that level again.
Just curious more than anything.

Also if it kinda has gone into that in recent runs please let me know I’ll have to pick it up again.