Then next compositional trick, if your audience is finding the rule of thirds too subtle, is using converging line. This is the photographer’s way of pointing to the important part, and basically saying
“This is the bit I want you to look at, stupid!”
This works very well on landscapes giving very strong images which end up with a very graphic feel. The converging lines can be made up of anything from paths to roads or lakesides to streams, even man made structures like the lock gate in this picture ( a more subtle trick in this shot is the fact that the girl is looking at the point of interest, most people will look at what she is looking at).