One of those pictures has already happened and the other two probably won't because they're very vague (like the Westeros Kings in the background of Danaerys)
WHAT!? Actually two have already happened. Daenerys got preggo with Drogo's baby - that's her holding the dragon eggs she received as a wedding gift. Then there's the one of her in the fire, end of book 1 when she burns the witch who killed her baby and made Drogo all empty, and comes out unscathed as Mother of Dragons. Yah the dragon's huge, not a baby size, but that's why I like the comics. Artistic license! The other one, with the dragon rider... I can't remember if that one happened (I think I know what scene now that I think about it, but don't want to spoil it since it's from a lot later book), but it's from a comic book so probably grounded in some actual scene from GRRM's books.