What you should do is mix both. I'd say it would be good with the robot colourful but the background not.
Rather than have the whole thing colourful/not. It would help draw attention to the render.
Too many colours in v1 and they seem like randomly thrown over the signature. There is also some diagonal strange shit flowing right from the render.
At the same time, v2 isn't really much better, no colours. I personally hate black&white work...