Zbrush is software designed for organic style sculpting. It is capable of high levels of detail and complexity, which makes it a favourite with concept artists. If you google pixologic or zbrush central, you will get a good idea.
yup, i wasn't sure when i saw the thumbnail, but now that i see it full view, yes, yes this is a really bizarre little creature you've created, it resembles close enough to a finger there is still that recognition, but it been modified to the point of having all concrete evidence of said finger-ness removed and is its own thing. got a story for him?