I guess you can call this the first still from Harry Potter and the Half-Blood Prince , but all it appears to be to me is a picture of Daniel Radcliffe.
I apologize for leading you here to look at this picture, but I know Harry Potter fans will want to see it regardless of its doring nature. Hopefully Warner Bros. will soon release an image worth notifying you about. For now, this is it. However, you can click it to make it even bigger, but I am afraid it is just as tiresome.