This is beautiful! And i love how it gets darker to the left and all the lines of trees in the background also i like how the two young girls aren't quite centered and there is light shining on there heads.
Simple yet effective. The tree in the foreground could potentially be a distraction but the vignetting helps blend it in to the scene. I like the positioning of the girls as it helps create a relationship between them visually and helps anchor the scene. Its also interesting that they are sitting in line with the brightest part of the scene which helps draw your eye to them.