Ok, after building out our core lifecast and having a life-sized figure to work on, we are finally on to the sculpting stage. This is the part where I take some clay, and start making the character that will eventually become the one and only Zoidberg.
There are a million sculpting techniques and a million ways to approach a new sculpture, so don't take my methods as gospel--it's just what seems to work for me. But to start, the thing I think about is really wanting to try and get the scale right. Shape placement and general forms and anatomy are what I'm focusing on right now. Anatomy is something that I picked up from general observation and a bit of research (on the internet or in books). Human, animal, insect, or in this case decapod--really anything that you can look at and apply will make it more realistic and believable.
Sometimes I can get lucky and attack a sculpture and go right to the character that I am trying to find, other times it takes a lot of pushing and pulling on the clay to get there. Forms are always more important than the details.
We’re going to be sculpting on the lifecast that I have of our model, because we want it to fit on top of his head and line up with his mouth and eyes (so he will be able to eventually see and speak and breathe in this thing).
For clay choices, there are two main categories: water-based and oil-based. With water based clays (such as Laguna EM-217, otherwise known as WED) you have to stay aware of how wet or dry the clay is getting. If the water clay gets too dry, it will start to crack and crumble. If it's too wet, it's like sculpting with soup. Oil-based clays offer more versatility. Out of necessity, I stay away from clays with sulfur in them because sulfur will inhibit platinum-based silicones when you are making your mask molds.
My two main choices in oil clay are Chavant Medium and Monster Clay. Both of these clays have their quirks and which one I pick sometimes just depends on what mood I'm in. In general, I love Chavant for prosthetics, and love Monster Clay for everything else. For Zoidberg, I'll be using Monster Clay. Its high wax content is really nice for both crisp details and smooth shapes.