I'm going to do a couple posts on painting horses in Photoshop. Here's the lay-in of the drawing for the horse, performing a pretty dressage pirouette. Of course, before any painting happens at all, it's most important to get the drawing right. This guys' left front leg went through at least 10 redraws to get it to look natural and correct. Bust out your anatomy books and look at photos to get the shapes and lines correct. Sketch in a rough skeleton (not a real one, just some lines and scribbles where the joints go) and some basic shapes to begin....