If you have a few hours, please check out her other posts as she is the most generous crafter and shares her process step by step and her bears are amazing .
If you click on the picture, you can hopefully get a better idea of the different textures but I need to experiment more on what textures can be created using different layering of different animal fibers . I tend to use soft to medium fibers even for my cores....merino to colonial but avoid coarser fibers like Romney . I would imagine that the length of the core fiber that you pull out will effect both the softness and length of the resulting "fur" .
Happy felting !