the tracks in the background bother me a bit and the reflection from the sun on right arm nice com otherwise light could have been a little better keep pluckin away!!!!!
Back to comment: Sorry to say but this image would have conveyed Simple Pleasures to me better if she had been sitting under a tree or by some water. Railroad tracks are generally dirty and few people I know would be willing to sit on them to play a guitar. On the technical side, it appears that the image is out of focus. This could be a result of not sharpening the image after resizing or from poor focusing.
The concept is nice for an album cover, the costume and makeup could use some help I think. I like the train tracks. I like the girl's expression, though it doesn't seem to convey "peace and quiet"...more like determination.
The rails are blown, and so is the right arm. Also, there are some compression artifacts especially noticeable on the model's face. Other than that, this is a good pic, with nice leading lines, and overall good composition.