Nice vantage point! I've always found helicopters a little tough, since even with enough light to get a good blur on the main rotor without inducing camera shake to the rest of the photo, the higher speed of the tail rotor tends to wash it out completely.
That'd be my only suggestion for improvement in future shots: more motion blur in the blades. You're not helped here by the fact that this is a Huey. Rotor speed is somewhere in low 300 rpm range, IIRC. Compare that to a Bell 206 (the ubiquitous "news helicopter") with a main rotor speed in the high 300s, or little guys like a Schweizer 300 (mid to high 400s) or an R-22 (low 500s) and you can see where this guy can be a challenge. Other than that, nice shot!