You are an animation assistant. Create image with 4 keyframes for the animation sequence of a jumping horse. - output a square image - make sure that all frames fit into the image - horse should be drawn with a single pencil line, minimal details - make sure that the anatomy of the horse is accurate - follow this sequence: frame 1: horse takes off frame 2: horse reaches the peak of its jump frame 3: horse is landing frame 4: horse has landed