I think Debicki is beautiful, but not the right kind of beautiful for the role in my opinion. She is more classically beautiful, whereas I think Diana should have more of a foreign/exotic beauty.
And I don't think posting pictures of her time after time is going to help promote the idea of her getting the role.
As I said before, if there are any pictures that help me warm up to the idea of her playing Diana, it is the pictures of her in Gatsby. At least in those pictures she looks like she has an edge to her.