I've started working with cold porcelain without any clay sculpting tool, which, I admit, makes it more challenging and yeah, most of the time kind of frustrating. I told myself to purchase a set of these sculpting tools but as I looked around in various bookstores/hardware shops/craft stores, I realized that they are quite hard to find and when I found a set (a sculpting set for cake decorating in the bakery section of a department store), they cost higher than I expected.
For quick projects, I prefer to paint the faces on the heads. Most of the time they come out looking better, because I have better control with a brush. However, I prefer sculpted faces because they simply look better and more realistic. It's not even that difficult outside of the fact that you have to work fast with cold porcelain, since sculpting when it's already drying will result in cracks.
On that note, I made a new video that will teach you how to sculpt a simple face in less than 3 minutes. The face that will come out is rather basic (and doesn't look that good, to be honest) but it should serve as a starting point.
When you get the hang of things, you can create far more detailed faces.
(I apologize if the video is kind of shaky in certain places. I just bought a new lazy pod and am still not used to working with it - I kept elbowing the damn thing. :p )
I've already posted a blog about the difference between polymer and cold porcelain. This post is some kind of a deuxième partie of that, plus Daryl Dixon!
I bought a pack of bakeable clay from the bookstore due to curiosity. It's the 'generic' type (I actually forgot the product name already) and it only costs less than a dollar, which is a lot cheaper than the mainstream polymer clay.
If you are still contemplating on which type of clay to use (baked or air-dried), here are some additional pros and cons that I encountered using bakeable clay. Note that this is just MY personal opinion and MY own experience on working on this kind of clay may be different from others.
One of the downsides of Cold Porcelain is that it's prone to cracks while drying. If you're planning to sculpt using cold porcelain as a hobby, you need to be aware that you're going to be spending a lot of time fixing cracks.
Thankfully, fixing said cracks isn't that difficult and won't require material that you don't already have lying around. You just need the sculpting tool you normally use, a small amount of glue, a fresh batch of cold porcelain, oil, and what little amount of time it takes to fill in the cracks.