I don't mean to disparage the quality of the artwork, but its style is completely different from the pixel art and without the option to disable it, would make the game entirely unplayable for me.
It would probably be worth arguing that high-resolution character portraits go against the spirit of the low-res medium, where the character sprites leave just enough to the imagination to leave the particulars of their countenance, and many other things, up to the player.
I probably would not have played Gemini Rue if it hadn't provided the option to disable the character portraits, and I probably wouldn't have been able to fully appreciate Blackwell, either; Blackwell Legacy, if I remember correctly, provided this option. I've heard Deception is much longer than the others. Does it force you to display these portraits?