Dip your tool in Vaseline before sliding it along the putty. Now get your mind out of the gutter. Vaseline helps the sculpting tools not stick and pull the putty. You can get super fine details with this stuff, and you don't need to bake it. The only drawback to this is that you need to work in small sections at a time. If you get over ambitious, you may run out of time to refine all the details before the whole thing gets stiff. I try to work in small areas that can have clearly defined borders. Then the next section runs right up to, and sometimes over, the last. There were around 25 different sections I sculpted to get this whole thing done. Once it's set, it can be handled all you like, and can even be Dremelled immediately.
This stuff can also blend itself invisible at the edges; just press and drag outward from the main sculpt body to erase edges or drag them into other details like existing wrinkles.
This stuff can also blend itself invisible at the edges; just press and drag outward from the main sculpt body to erase edges or drag them into other details like existing wrinkles.