[bman]

IIRC in the 'olden days' the Phoenix would have a black triangle where the phoenix symbol would go on top of. Only Dark Phoenix wouldn't have the triangle back ground. However I stopped reading X-men back at the beginning of Astonishing when they brought Colossus back - that was such a retarded way to do it imo. So I think if this sketch was given to you then it should be Dark Phoenix.