Hey Gary,
Nice shot, and from the image size I see here, focus appears to not be an issue. Fine compositions, colors, etc!
But, I, too, have more trouble with the longer lenses and focus; care to tell us where in this image you were trying to achieve maximum focus? The two, or even three, distinct "layers" here invite a variety of techniques. Where did you try to nail it?
Thanks, and keep up the fine work!
Ron