Nice catch, Chris.
Yes, these guys are constantly on the move, so you did well to get him at all!
As far as critique that you asked for: the image is nice and sharp, with a great pose. I don't know how much of a crop this represents, but I might be interested in seeing more of the environment, with a less tight crop if available.
There is some noise that could probably be addressed in post-processing. I'm guessing the ISO needed to be on the high side, as this guy was likely not in much light, a fast shutter speed was needed, etc.
But regardless, any clean, crisp shot of a Warbler is something to be proud of!