What painting method did you use? I've seen some artists make a silhouette of their mech and then paint in the finer details, like armor, weapons and circuitry. I've been experimenting with this method myself recently. Is that what you did?
I think that sounds like what I did pretty much. I was just practicing and didn't know what I was doing so just splurged a black mass to look sort of humanoid and then patched on red shaped for armor then as you said started refining. It looks very professional when done