Practising proportions with a pencil sketch of a stone figure, from a photo of Murcia Cathedral roof snapped some years back.
Getting the mid-point (advised in Dodson’s Keys to Drawing) is very useful. From the top of the head to bottom of the plinth it turns out to be just to the right of the knee, which was surprising. Must do more of that as proportions are a major weak point. Still managed to make the cherub’s shield look like a melted ice cream tortoise.
I read somewhere that these rooftop statues were often made deliberately too tall, so that when viewed from below they would appear correctly proportioned.