I'm not the author, but I can answer that one for you. This is actually made for a wargame called Infinity. The guy in the high-tech suit is a Myrmidon in service of ALEPH, the AI governing the Human Sphere. In most cases, Corvus Belli (the company that runs Infinity) designs these things themselves, and then has a great illustrator like the author of this image bring it to life. In other words, chances are he doesn't actually know where the inspiration came from. Regardless of this, so whether he was or wasn't a part of the actual design process, the answer to your question is likely that the inspiration instead came simply from human musculature, presented in a way that suits ALEPH's high-tech nature.