Definitely has potential. I like designs that stick out more, which may just be a personal preference, but all the colors seem too soft. Maybe darken the outlines a teeny weeny itty bitty bit?
It actually might look good how it is already on a tee, though, so who knows. If you take heed of this advice, play around with some shades and see if you like any of it.
again, cool idea. I'd definitely 100% submit it at some point in time, once you're happy with it;)
I'm not sure I completely understand the concept, but robot fans will adore. The lower head could be disembodied, so it might help to make it slightly smaller to show shoulders. That, or put the lower robot's right arm on the upper robot's left shoulder to imply the body. That may look more "snuggly" and win you some compassion points.
I like V1 and V2 the best so far, and I think the heart really makes it clearer that the robot on the right isn't just holding a severed robot head. My opinion is to take V1 and remove just a tiny bit of the slant like you did in V2.
This could go places. My thoughts are perhaps it needs a mechanical heart. maybe the outline could be scrap metal or metal pop riveted together. And i think it looks a little off with the robots goind outside the line of the heart. But get others oppinions too.