Sweet Sunset

The hair moves quite naturally besides the tops of both the mane and the tail, and the detail in shading is quite impressive. I must admit, the anatomy and pose is rather off and confusing. The neck is a touch stalky and, in conclusion, makes Her Highness a little chubby. I understand you were aiming for a thick and realistic neck but since horses have such long necks this pose is awkward and looks uncomfortable. Most likely the neck would curve or stretch all the way outward rather than compress at the nape. The back leg is upward like it is uncomfortable to lay it down and also disappears behind the tail which should be making an impression or a bump behind it. At first glance I loved the shading with your light source and background, but the anatomy kind of ruined the hard work you put into it. It seems like you were so focused on the shading and coloring that you developed tunnel vision, and did not see that the body posture was off. Only one more thing, I loved the dramatization of shading but it doesn't give me much to look at. Most people who draw silhouettes will create a complicated or elegant pose to let the eyes wander, or even add different colors to shade with, the only things I really can enjoy are the details in the mane and tail and the light source. But I also notice that the wings' layering and texture is went along beautifully along with the eye, just keep in mind the objective of what you want a viewer to pay attention to. I hope this all helps you improve and creates some thoughts. Have a good day and take care~