Let them dry for a few minutes. They need to get firmer. That way they won’t lose the shape when you cut them. Roll two 8 mm balls of white flower paste (gum paste). Let them dry for a while too.
When all parts are quite firm, trim them as shown in the photo. Stick the hands to the arms. Use a very small amount of glue. That way the parts won’t slide around and the glue won’t ooze out.