For most people drawing foreshortening is difficult and I am no exception. I remember very well my first exercise from the Bert Dodson book “Keys to drawings” (my favorite drawing books on amazon). He requests the reader to draw the own left or right hand with the fingers pointing to the viewer. That exercise gets the right side of the brain in action. To close one eye helps a lot. It stops the left side of the brain interfering again and again suggesting that those fingers should be drawn longer. I commend to try yourself to get that funny feeling inside your head
Ball pen sketch of the left hand, drawing exercise to learn foreshortening.