Re: spray paint, unless you're extraordinarily talented with "rattle can" spray paint, I wouldn't use it to add colour to the face of a puppet. It's impossible to control the spray, which is the reason most people use an airbrush. At a shop where I used to work the shop supervisor sometimes used Pantone Markers to add colour and details to the faces of soft puppets. I haven't don it myself, but it seemed to work well!