When it comes to portrait work, things like camera settings and lighting often have quantifiable positions and settings, and in that sense, they can be more easily learned (to a degree). Posing, on the other hand, is a more subjective art and often presents difficulty to newer photographers. One useful technique is knowing how to make your subjects look taller, and this great video tutorial will show you what you need to know to accomplish that.
Coming to you from Anita Sadowska, this excellent video tutorial will show you how to make your subjects look taller in images. Posing can be both artistic and functional, and learning how to control both facets is critical to creating compelling images that convey whatever it is your clients are looking for. As you will see, this is a great exercise in both perspective and focal length. By employing a wider focal length than you might usually use for a portrait shot, you can elongate your subject's limbs and give them the appearance of being taller. This can be used to create shots that render your subjects in a powerful light. Check out the video above for the full rundown from Sadowska.