A drawing of David Cameron because drawing isn’t like riding a bicycle, essentially if you stop doing it for a while it gets much worse. I can’t illustrate this without drawing something that everyone can recognise, obviously it isn’t a very good likeness, but I guess you will concede that it looks a bit like him.
The tricky bit, from the artist’s point of view is trying to work out what exactly is wrong with it. Eyes, nose, chin, etc. presumably without being able to this it is difficult to improve.
From a technical point of view, all of it was drawn with this grade B pencil and the original is A4 size, time wise I think it too about an hour.