*lightbulb* I have an
excuse explanation!
So Gaara's a jinchurriki for the Shukaku, yeah?
So Shukaku = Raccoon thing.
So:

Is:
NEITHER OF THEM HAVE EYEBROWS.Well, the raccoon has white stripes or something.
Conclusion?

But no white stripes.
Just stylized circles around his eyes. NOT eyeliner.