For this you need,
- construction paper or paint
- and paper mache.
Step 1: The Form, the Paper Mache, and Paint
(Now, for this step i used plaster-of-paris strips but paper mache would probably look nicer). cover the helmet in paper mache and wait for it to dry. After that, paint it red.
Step 2: The Crest and the Trim
To make the crest just cut out the shapes below at about 80% of the size of the picture out of cardboard then glue them together and make a fold in the center of the shield. now paint it red and give the edges a black trim (to make it stand out) and glue it to the top of the helmet, now you are ready to rule the earth!