Getting serious on designs

[Sketchasaurus]

I'd suggest exaggerating the features and poses more, for the heroic character, enlarging the chest and shoulders a bit and perhaps even animating the character so that the cape seems to always be flowing in the wind. take this image I found via a google search of "superhero stance"

Also, compared to the other two, the color palette for bronze has very little contrast which hinders the readability.