The range of color tones and contrasts in this image really make it pleasing to the eye, I especially enjoy the way the light is diffused through the clouds. I think the vastness implied by both the ground and the sky help to promote the infinite feeling you were going for with the horizon, but with the titling, I find myself straining to see a bit more sharpness (and thus interest) going out into the distance - assuming the horizon is a focus for the image. That said, the long, lovely, curling cloud across the middle does grab my eye, and keeps it near horizon level creating an interest point in that area.
While I do think the way the color/lighting tones play is an asset to the photo - the overall darkness to it does make me, the viewer, struggle to determine what kind of scene (beyond that of a sunrise/sunset situation) I am looking at. I couldn't tell that this had an ocean aspect until I read the comments you'd left. Its an excellent photo, and were it a little lighter and a little sharper I think it would be even better. Well done.