This is absolutely lovely! Beautiful! I love her expression and that there is so much feelings in this picture. Also the color of the dress, her hair which matches the sand and that you got such perfect focus. You should be really proud! Too bad that there is not as much sand on the right side as on the left, but really that does not matter at all. The composition is flawless and I actually don't have any critique, I just wanted to express how awesome this picture really is.
Congratulations to a great picture!
Have a nice day