https://pbs.twimg.com/media/FIhjBaoXMAIw6X-?format=jpg&name=orig
WTF, they're showing Jane as being a foot taller than Spiderman? Natalie Portman is three feet tall! Hobbits think she's short!
Good catch.
Pretty sure when you become Thor you get bigger. Look to the comics for examples of this.
Just looks like bad art. A lot of things are out of proportion.