Sir, publication #16 gave you 5 stars just because it has a metallic effect, because the same design gave you 3 stars with another mockup. Ask him to put it on a white background to see if it looks like 5 stars. and the #19 with a golden effect also 5 stars, but ask for it on a white background.
Yes that's the point ...This design is originally not created in metalic theme, it's just a mockup file. Maybe contest holder will find in handover process and design will be no use...putting it on plain background will prove it