I like the stars and sunset in the background, but I'm a little confused on the bluish greens comming from the grape vines. It might look better if you had the bushes on the left blend into the color as the vine gets further away from the viewer. On the right I'm not sure if the light is just hitting the top of the branches or it's lighting up some sort of tree behind them. The upper left corner, if you cut the photo diagonally, looks very detailed, intricate and awesome. The bottom right just seems more bland/shadow. Something placed on the bottom right, like a hoe or a wine barrel might help give the bottom right something.
Great place and a beautiful composition! Looks like you walked across with the flash gun! Maybe a dusk shot would have worked better, because the stars are not doing much and the long exposure has added too much noise..