She seems to be missing something. And this is after poster enhancement got done with her.
All our beloved favorite super-heroines have boobage by the truckload. The problem is, most actresses don't. Comic book proportions are relatively hard to find in Real Life (especially among the acting population), so more often than not, the folks behind the movies simply won't try to replicate the sizable endowments of their comic book counterparts, and will cast actors who are noticeably more commonly proportioned.
Of course, slim actresses with large breasts usually can't get work because the industry considers anything above a C to be "huge" and will only cast her as eye candy. And the majority of actresses who have G-cups and bigger tend to be Hollywood Pudgy.
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Anime and Manga
Mahou Sensei Negima! is known for the bust size of some of its girls and staff (in particular, Shizuna). This didn't spill over into the live action adaptation. In-story, Asakura attempts to imitate Shizuna, but this trope tips off her target.
The stage adaptation of Bleach featured a less-than-busty Orihime. The same happened to Matsumoto. Her shirt was kept loose though, so the joke could still be made.
In both the anime and manga versions of Sailor Moon, Sailor Jupiter is known to have a large chest (or, is quite talented). She's rather flat comparatively in both the Sera Myu and Pretty Guardian Sailor Moon. The Starlights were even more noticeably flat (comparatively) when in Senshi form in the Sera Myu since their costumes were much more revealing than the bulky costumes worn by the other Senshi.
Kei Kishimoto from Gantz had very large breasts, to the point where the title character actually nicknamed her "Miss Melons". The actress playing her in the Live-Action Adaptation, Natsuna, is far less gifted in that regard.
A Cavewoman series titled Cavewoman: The Movie, played this for laughs, as the actress set to play Cavewoman (in-universe) was a few cup sizes short of her comic book counterpart, and didn't she know it.
The very busty Nancy Callahan from Sin City was portrayed on the big screen by the more realistically endowed Jessica Alba.
Mary Jane Watson, girlfriend and later wife of Spider-Man, is pretty much always drawn with breasts rivaling if not exceeding the superpowered women surrounding her. In the first three 2000s movies she's played by Kirsten Dunst, who didn't quite measure up.
The Lara Croft: Tomb Raider films. In the video games, Lara Croft's breasts are exceedingly generous. In the films, Angelina Jolie is padded to a D-cup. In an interview Angelina said that anything larger would have made it difficult to do her own stunts.
Neither of the actresses who portrayed April in the Teenage Mutant Ninja Turtleslive action movies (Judith Hoag in the first, Paige Turco in the next two) could really fill out a jumpsuit like their animated counterpart. Likely justified in that the movies were based off the original comics and not the animated series. In the comics, she's more average.
The remake of The Fog cast the flat-chested Selma Blair in a role originally played by the busty Adrienne Barbeau. To make this work, the director outfitted Blair with additional padding to increase her character's bust size.
Julia Roberts' portrayal of Erin Brockovich in the film of the same name garned quite a bit of attention due to how Julia needed some boosting in this area to match the real Erin. In a post-release Oprah interview, their enhancement were the prominent topic of discussion, rather than the remarkable achievements of the women they based their movie upon.
Jenny Humphrey from Gossip Girl has enormous boobs as a prominent character feature - if any boy is attracted to her it's because of her breasts, and she laments them despite the fact that she's aware of the sex appeal. She was played by tall, skinny Taylor Momsen in the TV show.
Also inverted with Fred/Illyria in the Angel comics, which gives her a very large chest in comparison to the very petite actress.
Sookie Stackhouse from True Blood although pointed out in every book that she was pretty well endowed, in the series she is played by an average if not almost small chested, Anna Paquin (who is a second offender after not being able to fill Rogue's bra in X-Men). They try to make up though by giving her skimpier and skimpier outfits and stuffing her bra more and more as the show progressed.
In the Dexter novels, his sister Deb is described as very busty, but on the show Deb is portrayed by (relatively) flat-chested Jennifer Carpenter. The show version at one point even laments her small bust!
In Need For Speed: The Run, one of the main female characters is voiced by Christina Hendricks. The character model is based on her, but in a surprising inversion actually has significantly smaller breasts.