This powerful panel from issue sixty-six of the UK Masters of the Universe comic has always been one of my favorites. While it may not be the most superbly illustrated panel, the positioning of He-Man, with the Sword of Power breaking free of the panel, work so beautifully! The line work throughout the background, alongside the colors, really do convey that something incredible is happening. He-Man is almost dwarfed by the power around him!
(click on the image to see it at full-size)