Sebastian Vettel became Formula One's youngest double world champion at Suzuka on Sunday night but Red Bull team boss Christian Horner has already pinpointed two areas where the German could improve next season.
Horner says the German needs to work on some of his English jokes and improve his haircuts, which he describes as a little bit strange.
Apart from that, the 24-year-old has been simply phenomenal, a word that Horner used eight times in the space of a six-minute conversation with reporters in the team motorhome.
Vettel clinched the title after finishing third in Japan behind winner Jenson Button of McLaren and Ferrari's Fernando Alonso.
He has won nine of 15 races, been on pole position 12 times, finished on the podium on 14 occasions and, with four races to spare, is not finished yet.
That sort of supremacy has not been seen since Michael Schumacher was at his peak for Ferrari, and Vettel is only in his fourth full season.