I'm paraphrasing here, but if you read the cream legbar standard it says the eggs can either be blue or greenish, so blue eggs are not a given for the breed even if we wish. One thing I have found is that as the hen lays more and gets deeper into her cycle and the eggs get paler, the greenish eggs often then look more blue, although a pale blue. Your egg looks like it still has a deep color.
I have several birds that lay a bluish egg but my best blue comes from a little girl whose mother was an EE and her father was a mix. He hatched from a blue egg, but his sisters lay pink eggs.
I have several birds that lay a bluish egg but my best blue comes from a little girl whose mother was an EE and her father was a mix. He hatched from a blue egg, but his sisters lay pink eggs.