Can I ask someone more into CGI than me ......
OK, so the agency (presumably someone from there who is now admiring their P45) took a Virgin 747 and adapted the livery to BA. But why on earth go to all that trouble ? When BA have such a range of 747s already painted in their colours available at Heathrow to base the image on, why ever take a different one and then take all the time and effort to re-colour it ?