I know this is not exactly a crochet question, but related. Many amigurumi patterns call for embroidering details, especially faces. Though I understand how to do this, I don't know how to anchor the stitch so it can't be pulled easily. Sometimes it can be hidden if a part of the piece has a similar color, I just tie it there and then take the needle in the toy until it comes out in the right place and then take it back to secure it. But most of the times, I can't do this without leaving a very obvious knot of a contrasting color. How do I do this?
Diana