As I explained a few days ago, I absolutely loved the miniscule pieces of artwork featured on the initial cardbacks of the Masters of the Universe figures. As the line continued these illustrations would match the figures a great deal more in both design and pose. In this fascinating image we see what would have been the cardback illustration of He-Ro based upon the action figure that never made it past the prototype stage! When comparing this style of illustration to the one of the Skeletor cardback from a few days ago you can see the quality and style had changed dramatically by the end of the toyline.
(click on the image to see it at full-size)