This is the mother's right forearm. I have used a diamond wheel tool on the fur at the bottom of the photo. The testure at the top is from a masonry wheel on an angle grinder. You can see how much more dimension is achieved by using the diamond wheel. It is a lot more work, though. Also, you need a good strong light from the side in order to really see what you're doing.
This is a flared flat ended diamond tool on a small die-grinder for putting hairs on the cub's foot. I do a lot of shaping with this tool, as I put on the hair.
I use the same tool for cutting in the nose of this cub.
It's also handy for setting the eye back into the skull.
I use a larger die-grinder to open the area between the mother bear's leg and the cub's leg. I work the area from both sides until I have it opened.