The only blur here is a lack of focus, not due to motion. There's also quite a bit of artifacting in the blue sky that is distracting. I would crop this a bit tighter, putting the plane in the upper right to utilize the rule of thirds and remove a lot of the dead space in the sky.
The image isn't crisp -- I can't tell if that's because of motion or just poor focus. I do see some motion in the prop, but I really have to look to find that.
Nice capture in the manner of something fun to look at. I'm thinking either you had some problems sizing it for the challenge, or you did a major crop from a larger image...as posted, there is some substantial pixelation going on. More regarding the subject - I don't think there's really enough "Motion" in this shot. The only "Blur" is in the engine prop. Perhaps a motion panning approach for this may have been a little stronger?
I'm glad I read the title. Now I can see the girl. They used to do that in the old days, right? Amazing way to earn a living. I wish there was a crisp, stop-action shutter/focus on this subject. I know, I know, it's about motion. But the subject is so interesting one wants a good close look-see.
Well... sorry to be picky here, but the subject is blurry, but there's not much *motion* blur here (other than the propeller, I suppose). The shot is only about 9K -- you can submit up to 150K file sizes. You might want to learn how to better maximize the file before uploading. That'll give you crisper results!