to play Janis Joplin in a biopic
They'll have to ugly Shailene up a bit, but she has versatile looks. Very pretty, can be sexy, but she's not a bombshell. Give her no makeup, and some effects makeup to make her skin look worse, it could work. What I don't see addressed here is how the singing will be handled. But if it's about Janis as a person and her life, that takes an actress more than someone to actually imitate her voice. Shailene can probably pull off some bits singing in a low key way, hanging out. But the on stage bits I'd guess they use real Joplin vocals.
https://www.dailymail.co.uk/tvshowbiz/article-13835357/Shailene-Woodley-playing-Janis-Joplin-biopic.html