If you're in the U.S., what you're describing is the making and public display of an unauthorized derivative, which is copyright infringement. That it's for "your own personal use and you're not making money off it" doesn't change that, but it does mean that there's virtually no chance that anyone with rights in the underlying images will care.
It's also worth pointing out that the robot hand is something that Hugh Syme apparently took from a stock image, so he has virtually no basis to come after you even if he did care.