Edit Minecraft Skin in paint?

So in paint my skin with a new face equipped I have where previously the face was replaced by a new one: I have replaced the entire kopfläche against the new and done everything right only if I get memory when they save the transparency is lost. Then I imported it into the skindex editor and got only a white skin what is it?

Why do not you edit the skin directly on Skindex? I find it easier than using Paint or something, because you can see the result directly