Rainbow Dash, of all ponies, knows how to control her movement in the air. She'll be fine. Falling can be fun if you are able to stop your fall and begin to fly again instead of hitting the ground.
An interesting trick with the slight discoloration of her coat and cutie mark. I'm putting it down to the dusky conditions. By the way, lovely sky colours here, I really like the starry sky visible above the clouds, and the clouds themselves look nice. And her mane and tail are as vibrant as ever. Nicely done!