Isol's design was a bit more difficult than the other characters, because she wasn't human, so first we had to create a whole new alien race, Ghians (Lomina in the early version of the script)
From facial features:

To their body structure.

Originally they were supposed to have feathers instead of hair, but that was eventually changed for more conventional human-like look.
We also had to design style of their clothing that would make sense in the context of their culture and climate of their homeworld.

Then finally we got to designing Isol herself


And there she is, ready to meet you in a few short weeks!
