No cross I've seen looked that elegant. I'd say a GSD with a very tight coat. (but consider changing the name please, that one's over used and comes from the book Marley and Me and is just just just - an insult to the dog)
Long before there was a book called Marley and Me, there was the one and only Bob Marley. Any time I hear the name Marley, I assume - correctly or incorrectly, that the dog was named for the great reggae musician.