that looks like a decent start. i suggest moving the powerhead behind that DW, add some leaves on the bottom, switch out for less white rocks (maybe a diff color), add moss along the DW, and add one or more twigs in there (similarly placed as the big DW) that have very thin branches to contrast that one thick DW piece. should look great.
also use rocks of diff sizes, not just large and small, get some medium ones in there, but use a color that is somewhat similar to the substrate and the leaves you will be using.
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