When people complain about her eye makeup or some other feature making her stand out too much I think of her leaked survey description:
Sera- Sera is young, frenetic, and a brat through and through. She revels in the athleticism of being an elf, of being different. But her culture isn't elven, or for that matter strictly human. It's the underbelly of the city in her network of rogues; what you do it more important than where you're from, and friends open more doors than titles. Robs from the rich to keep for herself
She's young and likes to be different, it sounds like she intentionally tries to stand out from the "normals." When I was younger and less mature I wore thick eyeliner and piercings because I thought it made me different too (btw, growing up is the best
). So if her character design makes her stand out from the regular crowd of Thedosians, then I think they're visually telling her story quite well.
Edit: And with her dark eyeliner, "I don't care" hair, tattered clothes and bad ass boots, she's obviously into Thedas' version of grunge music 