Hello, What is the reason why Diana cannot return back to the Amazon island after leaving? If there's a comic book to reference please state the number and series. Thank-you.
Never read the comics, but the impression I got from the film was that Themyscira (the island) is not only hidden by a magical barrier created by Zeus but that it also changes locations periodically. So, it isn't that Diana can't ever return to it but it would be extremely difficult for her to find it again. Captain Trevor and his German pursuers stumbled on it by accident.
I'd say it follows a similar pattern to the other superhero movies [see spoiler]. Although I really enjoyed it as I love gods/goddesses and I think Gal is very attractive - would love her to do something with Thor. Spoiler She starts young, grows older. Leaves the island, joins the fight. An emotional loss for the sake of it. There's a twist. She kills the bad person