Love the idea and the sanguine colour works extremely well in this
As for critique ..... fabulous work on the head, neck and body
You got some issues with its legs though
Horse anatomy is quiet difficult though.
I would have liked to see some warmer colours in the horse too, as reflected light from the warm background colour.
Overall though, lovely work
"Once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return." - Leonardo da Vinci