I agree with WesternGuy, who is a pretty good landscape shooter: maybe look at a bit of lightening up of the foreground, so more detail is revealed. As to the horizon line...usually a dead-central placement of the horizon line does not work all that well. In this case, I think the sky and clouds are so strong, and the rocks so big, and interesting in appearance that this shot is one that CAN pull off a centered horizon line. But again, look at lightening up the foreground somewhat, and with that done, I think the shot will be elevated quite a bit. This shot soirt of has the look of a SOOC type exposure, one in which the exposure has not beenpost-process balanced/adjusted for the darker foreground and the brighter sky tones.