my DSLR is D80 w/ 18~135mm kit lens
http://i3.photobucket.com/albums/y71/fai_11/DSC_1055.jpg

Shutter speed 1/500 Aperture f5.6Focal Length 100m

1) I already set the largest aperture in pic#1, but I still can't blur the background (in this case, the bird and ocean are the background). What is the problem? and how do I fix that?

http://i3.photobucket.com/albums/y71/fai_11/DSC_1104.jpg
Shutter speed 1/1250Aperture f3.5Focal Length 18mm
2) Almost the same problem as #1. I want to bring out the focus on the lamp while trying blurry the background.

http://i3.photobucket.com/albums/y71/fai_11/DSC_1051.jpg
Shutter speed 1/640Aperture f5.3Focal length 66mm
3) How do i make the sky more blue in pic#3? Do i have to use a filteror I can do it by adjusting the setting? I already set the opimizeimage to "more vivid" mode.

http://i3.photobucket.com/albums/y71/fai_11/DSC_0952.jpg
Shutter speed 1/3200Aperture F8focal length 32mm
4) The bottom part (the sand) look underexposed. How do i fix that?

http://i3.photobucket.com/albums/y71/fai_11/DSC_0928.jpg
shutter speed 1/500Aperture f11focal length 35mm
5) The grass looks underexposed or the color doesn't look right? what are the problems? how do I fix them?Thanks for anyone answering my question : )