Personally I would just call him a copper dragon because of how the copper really is the most color you can see on him. Then in other pictures he looks to have yellow and a orangey pink that seems to be like a red wash in other bettas only its a different color on him.Due to various new mutations in the drgn variety, some people (in my country) call these colors copper drgn (according to the base color) while others would call them black drgn (according to it's origin). He is probably a mix between black drgn (silverish body with black fins) and other dragons.
Like the green and blue dragons, copper dragons don't usually have white/silver bodies. They remain copper. Their fins can show different combinations - the classic grey background with red rays, giving it that copper/gold look. Or it can also come in other colors; red, orange, yellow, and black.