#3 and #4 for me are absolutely beautiful. superb composition lighting and colour.
#1 might be more compelling if you had gotten closer for a more intimate portrait, as the background doesn't really enhance the portrait of the (shy?) girl.
#2 has got foreground interest in the (rock sculptures?) which contrast nicely with the mountains in the distance. however, the horizon that cuts the pic dead in the middle leaves me wondering if the rule of thirds could have been utilized here to give the photo more impact. the rock sculpture closest to the camera lacks sharpness, so a wider angle lens with more DOF could also be attempted.
You mean the darkening of the edges? No choice, I was using a step-down ring cos I brought along the wrong size of CP filter. Cannot go too wide if not will see the four corners. Kinda bad right?