I agree, that wood piece is fantastic! Is it real wood, and if so, natural or carved? No matter if it's natural or carved, or not even real wood, it looks great! I like the way you have the Java fern placed on it. I wouldn't cover it up with a whole lot of moss or other plants, because it's very dramatic with the structure showing. Also, it's the perfect size for that aquarium, the tank frames it very well.
Great job, can't wait to see it grown in and "matured"!
"May the Fish be with you."