To attach images to bones without scrambling their positions, you need to ensure that the images are correctly parented to the bones. When you drag an image to a bone or use the "Set Parent" option, make sure that the compensation is enabled. This can be done by toggling the "compensate" button, which looks like a lock icon, to prevent the images from moving when you change their parent. This feature allows you to make changes without affecting the parent-child relationship, keeping your images in place.
For creating child bones, you should first select the parent bone, then use the Create tool to draw the new bone. If you hold the Shift key while creating a new bone, it will not select the new bone, allowing you to continue creating sibling bones. If you want to create a child bone, ensure the parent bone is selected before drawing the new bone. This process should help you maintain the hierarchy and structure of your skeleton.