This is a good picture although with the bright whitish background, you would have needed to add 1+ - 2+ exposure stops to see the detail in the horse's face. Cameras tend to want to lower exposure levels with white (bright) background as about 20% of light reflects off white surfaces and the sensor reads it as needing less exposure. On the opposite spectrum, cameras tend to increase exposure with dark backgrounds since light is absorbed.
The one thing I really like is the reflecting colors in the horse's hair (green, magenta, blue, etc...) which adds a cool effect to the brown.