Well, what he basically did is place stones randomly in the face of the hill. The hill, I believe, is mainly substrate, so the stones are just accents. The key to the mountain look is not the direction it goes in, but simply having some rock showing through low growers like HC or UG etc. And if you look at an actual mountain, you can see how random the peaks are, yet uniform in there own way. You could pull it off in your scape by building them up under each wood stand in clusters, with the help of some substrate, and low growing plants in between each rock or cluster.
If I were you I would start by leaving the stones in the general area you have them in, but go down the line and push a few together here and there, kick a few out a few inches, topple some over, lean some up against the wood at an angle, etc. Pretend you're an earthquake or something, don't pay too much mind that you're scaping a tank or the outcome can become more uniform. Just keep imagining small tufts of plants between them as well, what you do now has to work together with everything else in the end.
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