The Nightborne are physiologically closer to Kal'dorei than Quel'dorei, but there are some differences due to the changes the Nightwell caused. They look more gaunt overall, somewhat pinched or even enervated, and their skin tones rather than deep purple to forest green range from violet to blue to slate gray. I like how the Shal'dorei also keep some of the more naturalistic and traditional Night Elven motifs in their armor and dress but with a very obvious Arcane bent - wisps of energy resembling plant-life or leaves, and organic affectations created from what looks like pure mana. You can see very obvious connections back to the Kal'dorei but with their own distinct aesthetic; much in the way that the Sin'dorei and Quel'dorei before them kept with the same overly grandiose style of architecture but removed the natural element in favor of purely magical/technical feats, a society that more reflected a move away from the Druidic path the post-Sundering Kal'dorei chose.