ONe photo is not really enough to give much of a critique of your riding.
I can say that you are turned out really nicely, the angle of your leg is just great and though I can see the scoliosis expressed in your upper body angle, it isn't bad. Head is looking forward and not tilted.
The two things that stand out are your lack of contact with the horse , (rein overly loose and draping), and that you seem to be too far back in the saddle , and I suspect that is because the saddle may be too big for you.
If you want a much more detailed critique, post a video.
You look very smart in that photo and I hope you enjoyed the show and perhaps took home a ribbon!