There are rare situations where the centered horizon works well. This is not one of them :-( It distracts me from the other elements in the image. As with the other elements, Adams used lots of dodge and burn in developing the print in order to produce the characteristic dramatic tonal range he is famous for. Most of his famous images are processed during development. I would prefer a processing in which the vegetation on the left is a tad darker (one zone blow current) and the stream in the same zone as the snow.