Make Bread Dough - Place eggs, one half of the butter, half the sugar, and salt in the mixer bowl. Mix at medium speed for 2 minutes. Add flour in batches alternating with parts of water between batches. Add dry-active yeast until well mixed. Then add, in order, remaining butter, orange zest, orange essence or orange blossom water, and remaining sugar. Mix well after each addition until a soft dough forms.
Transfer dough to a lightly floured work surface. Knead dough for a few minutes. Coat interior of a large bowl with butter. Transfer dough to the bowl, cover with plastic wrap, and let dough stand in a warm place until it doubles in size, about 1 hour.
Grease baking pan with butter. Transfer dough back to work surface and separate 10 oz of dough to decorate bread later. Cut remaining dough into 2 equal pieces. Take 1 portion and roll into a tight ball with your palms. Roll balls on surface. Place dough balls on the greased baking tray, 2-inches apart. Press down softly. Decorate loaves, cover in plastic wrap and let double in size in a warm place, about 2 hours.
Decorate Loaves - Move reserved dough onto the work surface. Knead dough and pinch-off 6 equal pieces. Roll 4 into logs and put bone joints at the ends of each. Brush each loaf with egg wash and cross 2 bones atop each loaf. Insert 1 reserved ball each in the middle where the bones cross. Brush egg wash over that.
Making Bread - Preheat oven to 350°F (175°C). Add a pinch of salt to remaining egg wash and brush the bread before -placing in the oven. Bake until golden brown, about 17-20 minutes. When the bottom of the bread become a deep golden brown, they're ready. Transfer to a wire rack to cool to room temperature. Once bread has cooled, brush with remain butter and then dust with sugar.