These guys look fantastic. I have one tiny criticism though if I may be so bold...
The reprolabels stickers let the figures down, because of the large block of white sitting above the 'crown' of the Decepticon logo. For my stickers, I take a craft knife and actually cut around the spikes at the top, so there isn't a large white block just sitting there.
Nothing to do with your work really, which is top notch.