Madeleine does look great in the photos above.
I've just studied some photos in Billet Bladet under the topic - Royals & Strapless Dresses.
Surprising for me, Madeleine looked horrid in each picture.
Strapless dresses don't suit her at all.
Her sister Victoria looked superb in the two or three in which she was captured.
Marie and Mary can pull off a strapless dress almost every time. Same with Letizia.
Maxima, like Madeleine, also looks terrible. Strapless dresses don't do anything for her at all.
Martha-Louise and Nathalie did not choose well when they wore strapless frocks either.
(I can't remember seeing Mette-Marit featured so maybe she doesn't do strapless.)