I've had this around for a while, and I might as well post it.
I mentioned a while back that I have a kinda/sorta job at a tattoo shop (selling prints), and when I heard that he really wanted to see my art (especially my Transformers art), I decided to whip this up. Needless to say, he was rather impressed.
A bit inspired by some of Alex Milne's work such as [link]
and Optimus himself a bit of the old bulky style from the Dreamwave comics.
Optimus Prime (C) Hasbro