I like the driftwood placement. With a tank that long you need a secondary focal point on the left side, otherwise the right side is going to look too heavy and the left will seem barren. But I wouldn't move all your rocks to the left. Maybe a few of them, not stacked by scattered, with another small piece of driftwood would be nice if you can get your hands on another small piece... and then a well placed, smaller rock by the large driftwood.
And as others have already said: that driftwood is awesome.