I have a gray horse, and I'm going through the same thing in only a matter of months. When I started working with her, she still had her summer coat, that was back in September last year, and then over the winter, she got a red tinted coat that hid all of her lighter points, and now as she's shedding out, she's definitely lighter, and you can see her marble like patterns much much better. Someone commented today who hasn't seen her since Nov. That her patterns were becoming more prominent. It will be interesting to see what she looks like in a couple of years, how much she's lightened out. I'll definitely share pictures as I start training her, and hopefully showing her. Your horse is adorable. She looks like a very sweet horse.