Well, for just throwing in some rock, it landed just right! I agree. A little height on one side or the other might look pretty good, but you definitely have an eye for aquascaping. Welcome to R2R by the way.
Oh, by the way. Looks like you may have the rocks a little close to the glass on the right side. You'll want to make sure you leave room to clean the glass. Other than that, Awesome job!