I used to use a Revlon Cuticle tool. I found it very good for sculpting. One end had a knife-like beak and the other end had a paddle. The Beak end was very good for sculpting the face and hair-which is the part I really enjoy doing. I used to use the paddle to rub fingerprints off things I sculpted, push the sculpey evenly over the proto-head and create the shapes of the eye-sockets. I guess I was too rough with it and it broke in 1/2. I'll have to find another one.
So I bought mini-clay shapers with soft silicone tips. I have metal clay scrapers, the kind with the wire loops. I also bought some sculpey long blades at an art store. They are long flat pieces of metal, one has a washboard pattern, which are not really sharp enough to cut skin. I have not been happy enough with my results to offer anything publicly. I guess I want too much perfection. I should probably practice more because from the stuff I worked on a few years ago it looks like I was heading in the right direction.
Examples of my work can be found here:
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"The days have gone down in the West behind the hills into shadow...How did it come to this?"