Ex-BBC Royal Correspondent Michael Cole has praised Princess Kate for making a “terribly effective” adjustment to a new image of Prince George. The close-up portrait was released to celebrate the future King’s 11th birthday and came with a message: “Wishing Prince George a very happy 11th birthday today!” Cole highlighted Kate’s decision to make the image black and white, something he says worked “terribly well”. “It’s a lovely portrait taken by his mother a few days ago”, he said. “He looks good, he looks 100 per cent Spencer. I remember saying to Princess Diana that she bred some height into…