1. Judge Death. Digitally enlarge mouth, rest is makeup.
2. Judge Fire. Body wreathed in fire, CGI skull. Probably the most complex/expensive one.
3. Judge Fear. Complete darkness behind visor, may not even need to be FX.
4. Judge Mortis. Digital horseskull on green painted actor head.
This could be tough on a limited budget, but there are some fairly decent references. What do you think?
Also, if anyone has a better suggestion for references, especially Mortis, please upload