This is some of the best weathering and eroded red paint I've seen in a while. And definitely surpasses anything I can accomplish thus far, so take my critiques with a grain of salt.
First of all, the mini works because it cuts a striking silhouete. With such low contrast between your choice of colors, the It's the silhouette that does more of the heavy lifting, attracting the eyes to the perimeter first. Only then do viewers' eyes get drawn into the interior, and then the salivation begins ;c) Because this paint job breaks tradition from painters who use much stronger contrast and flashier NMM to wow judges, it's kind of a high-concept piece. For example, look at some of the better rated landraiders and tanks on this sight. Those painters have found some excuse to paint extreme tone and value contrasts even on something as uniform as a giant box of steel.
So the the question is, how suitable was your concept to a GD contest, and does it suit the judges' tastes?