Here you go a scketch based on your brief where you can ask for any changes or make any suggestions. I took a look to your prefered style reference and drawed this jumping horse with simple brush strokes, using just 2 colors (can also be just one by using the red in white), and as you can see it works both well in black and white and inverted. It also has an eleganto look. I'm at your service for any input :-) Kind regards,