This is my first critique, so forgive me if it seems amateur in any way.
This is a magnificent photograph--it struck me immediately as a powerful piece, and as I continue to look at it all these lovely details continue to spring up and reignite that awe I first felt looking at the photograph,
Although there are plenty of pictures of people staring off into the distance at the beach, I love that you've taken a completely different mood here. Rather than the usual wistful, or longing for a loved one, feeling, your photograph portrays something much deeper. There is a sense of melancholy here, no doubt, but it is beautiful in the most unique way.
I particularly love the way you played with contrast here--the dark of her hair against the light of her dress makes for a fantastic focal point. Likewise, the difference in focus between the model and the background makes the photograph pop even more powerfully.
My first thought upon seeing "In Longing Spirit" was that I loved the composition, with the background unfocused almost to obscurity to draw my focus entirely on the figure at center. But it was the composition of the figure that really blew me away - the pose, the exposed shoulder and the way the light almost seems to revel the skeletal structure underneath, the loose strands of hair... Something about the whole created is just striking to me. Her disheveled look makes me imagine this whole scenario of a woman waiting on the cool beach for her wayward sailor.
There isn't anything to define the exact situation, and I love that its left to the viewer to give the image context, and while it isn't the most original pose, its effective in this case (rather than cliched).
My opinion overall: A lovely photograph, and you obviously paid a lot of attention to the details and textures.