Shaak Ti has the same colouring and doesn't look awful.
Cosplayers don't exactly have a movie-level makeup budget or professional makeup artists / weta-workshop alien-body-bits people to work on them.
This isn't dressing up as Chun-Li we're talking about here. This is an alien with horns and head-tails that need to look completely integrated, need to look like part of her body. That's kinda beyond the average cosplayer, but I trust the Lucasfilm crew to do it right