This is a very popular request. However MyJLC was designed as a mix of simulator and dress up. It’s a highly interactive 2D game with a large amount of customization. It includes thousands of sprites and hundreds of animations for now. As you see dev was trying to get the most from a single pose.
Unfortunately adding more poses means remaking all game assets from scratch for each one. And it’s very time-consuming to achieve the same level of details for multiple scenes. This way, dev considers it possible somewhere in future, but it’s the lowest priority feature for now. If you'd like to know more about it dev has separate post on this topic.