So I wanted to share this with you...since we always say that molding a 3D figurine depends on it's position as well. What I don't think we often mention is that the mold doesn't really have to be all flat surfaced.
I have an example. On this picture I made a clay child (Chef will call it creepy) that is made for a Cherub. I made this figurine a while ago, and wasn't so on top of how to position my object for best molding. So the knees are bent, and the arms are not exactly on it's side, but it's ok.
The surface of the mold can be like a hill. Just follow the line you draw down on your figure in the middle. It may end up like a road in the mountains.
The top, which is the second part of this mold to make 3D figurine, will be to total opposite of this, so they will close perfectly, rather it is flat or wavy.
I make a EZ shell maker hard shell for these type of molds. They allow you to keep your mold thinner for easy molding, but it will hold the pieces together.


See how it comes up under the knees and also at the hands.
(The finished mold looks like what I shoed here before of the human molds)