The sepia tones of this piece are what first caught my eye. I like the angle of the second railroad track in relation to the angle the shot was taken.
The whimsical stance your model has taken is very sweet, indeed.
The way the light outlines the umbrella looks kind of weird at first glance, especially the light underneath. It seems to wash it out slightly.

I like how the model is standing in the middle of the tracks. As the rails go off into the distance, they outline her upper body, which provides a neat effect for the eyes. I also like the way the trees border the upper corners of the picture.

All in all I really enjoyed seeing this piece!

I like how the instantly apparent lack of symmetry contributes to an over-all sense of balance. You didn't go for the obvious composition, and I'm impressed by that. Everything is exactly where it should be yet you've managed to create a very relaxed and natural picture.

The expression on the model's face lifts the photo from simply being a pretty autumnal photo to being something more fun and more memorable. It looks like one of those hazy golden memories that occupy the comforting part of your mind.

I imagine the whole tone of the image would be completely different if the model wasn't smiling so brightly or if her face wasn't visible. As much as I adore the vivacious mood of this picture I would also be really interested to see slightly different interpretations of the theme with differing facial expressions or positions from the model, more out of curiosity than any kind of need to improve on what is a really lovely and uplifting photograph.