Something I hate sketching, always have found these awkward ! Allowed 30 mins for this one.
It’s something about the shape , that and not many people will model , let you sketch their feet ? Later in school , I remember we had a rubber bendy model foot with bits missing out of it . Anatomy drawing classes was always difficult from pictures and a wooden model doll at school. ( It was only senior school , no life model’s allowed. , yes we asked ? )