Its looking good!! My eye goes directly to the piece of drift wood. I would consider centering it and placing the rocks that are in the corner around it with the longer plants at the back. Thats just my opinion though I really do think its looking nice, and I really like the black sand.
I think it looks good too. It can be tough but try to be patient and let it grow a bit. It never looks they way you visioned when all you have is small wee plants.