When asked about the differnt stills and marketing material for Lex Luthor in Batman v Superman: Dawn of Justice (particualrly about Lex's hair), Jessie Eisenberg described the scene where Lex loses his hair as the greatest scene in his career to date. Said Eisenberg, "When you see the movie, you'll see. It's the greatest scene that I've ever gotten to take part in — it accounts for the change in hair."
As for the comic book fans that don't think he can do the role justice, Eisenberg admits that he finds that way of thinking a bit "disconcerting". "The only difference between this movie and everything else I've ever been in is this has an audience that has prior expectations, and that's the only thing that I find disconcerting because it feels like some people are occasionally ready to get angry at me for the part they haven't seen me play yet. It's bewildering." Director Zack Snyder recently echoed these same sentiments, citing that what's been revealed in the trailers is only the tip of the iceberg.
Batman v Superman: Dawn of Justice arrives in North American theaters on March 25, 2016.