When composing the post you can add text both above or below the image. It's a nice shot but would be even better if the bike/rider was a little sharper. With 1/40 it's always going to be tricky to get many keepers but it's always fun trying
It depends on the speed of the rider but 1/125 will normally provide a good number of keepers and still blur the background, just not so great in slow corners. I'm not sure what focus area you are using but sometimes with panning it's easier to use a single point instead of a larger area, then just place that point on the rider and try to make sure it stays with them as you pan. Also mode 2 on the lens if you are not already using this.
_U3A0047-Edit-Edit by MPC, on Flickr
