Kevin Wilson did several videos on Peter Chan’s Herons Bonsai YouTube channel showing how to deal with several yews with similar straight trunks. He demonstrated both pruning and carving techniques.The deadwood will need some help.
Right now, it is just a broken end, and the tree has no real taper to speak off. You can work the deadwood to enhance the taper & aged look. Consider getting someone who is experienced in deadwood work to assist there.
The surface of the lower dead part seems to have been worked with a grinder to get small grooves. I would recommend working with handtools, taking it slower and allowing the natural grain to come out instead of carving