I’ve not done much practise on catching the likeness of facial features and so, it would be fair to say, I suck at it. However, I tried a bit of practice yesterday using some source pictures I found online:

I don’t think I got particularly close but at least when I photographed the sketch today, the iPad threw up some boxes which showed it recognised 2-3 of them as faces (depending partly on the angle and lighting). More practise needed though.