You asked for some additional feedback, so I'll leave it here : )
I think the image would have been stronger on its own without the vignette. I can't really put my finger on why, but using a heavy vignette like that seems...amateurish. I know that's a strong word, but I don't mean for it to sound too harsh. A light vignette that almost blends in with the image might have complimented the scene and helped keep the focus on the tree, but I just think the vignette is too overpowering.
I like the fence in the foreground. I think it adds depth. I think I would have also liked a bit more fine sharpening to pull out the detail in the grass.