'What's the point of a 'fathers' day' picture showing the back of people's heads?'
Quite possibly because Kate and William didn't want the more maniacal members of the Sussex Squad passing pathetic judgement on their children's appearances. I mean they're doing their usual in-depth
analysis anyway but at least it's removed the opportunity for the Squaddies to rip their looks apart.
It's a nice photo, showing a loving father with his children - appropriate for the occasion.