"Riding high: a mock-up of how Mark Wallinger's giant horse might look at Ebbsfleet"
The model in the article is very different from the picture you show here. I think your picture is of a photo of a real grey horse while the article shows the model of the finished artwork, which has nowhere near such good conformation.
"Riding high: a mock-up of how Mark Wallinger's giant horse might look at Ebbsfleet"