Here is a lovely Robin Davies illustration from the Masters of the Universe Ladybird book "He-Man meets the Beast". It is interesting to see Prince Adam riding a steed with Cringer by his side. One of my favorite things about this illustration, aside from the wonderful color scheme throughout this piece, is the design of the royal ship that hovers across the desert. The detail on Teela and her horse in the background is a nice touch, too.
(click on the image to see it at full-size)