You probably want to avoid placing the horizon near center of the frame which is the classic "snapshot" type pic you see on Instagram all the time, unless it absolutely calls for it.
With the first two, there really isn't anything for the viewer to latch onto. Pretty scenes, but not a lot of color, depth, movement etc which spice up landscapes.
The last one is nicer, but as others have said, over processed.
Regarding what and what isn't a distraction, it really depends on what your subject is. For example, your bottom shot. If you wanted the colorful rocks to be your subject, then the really big empty dark blue sky distracts from it. In that case, you could crop out a lot of the sky, showing only a little bit for color contrast, and having the submerged pebbles more fill the frame.
IMHO, that is what makes landscapes so hard. With a portrait you know what the subject is...it's looking at you right in the face.
With a landscape, it is never that straight forward. You have to wait for the right time of day, you have to cut out the elements which don't add anything, you have to get on your belly or climb to the top of a mountain to get the right perspective, etc etc.