This looks great. Very similar to my structure with two bommies. I have a long tubular piece connecting the two as an arch.
One tip: Make sure the "center" of each mound is as hollow as you can get, not filled with rock. This allows MUCH better flow, and areas for fish and critters to hideout. I found that with creative rock placement, I was able to get a much better look, better flow, more hiding spaces with about 1/3 less rock.