Feed back on these pictures please?

Question:

Feed back on these pictures please?

Can I get some constructive criticism on these pictures? I take pics of friends for fun (my willing models ;) ) , but all the same , I'd like some feedback, thanks! How can I improve?

Meghan
http://i159.photobucket.com/albums/t149/...

Meghan Standing
http://i159.photobucket.com/albums/t149/...

Meghan Smile
http://i159.photobucket.com/albums/t149/...

Meghan Shoulder lean
http://i159.photobucket.com/albums/t149/...

Meghan B& W
http://i159.photobucket.com/albums/t149/...

Meghan Sea wall
http://i159.photobucket.com/albums/t149/...

Autumn sepia
http://i159.photobucket.com/albums/t149/...

Autumn face
http://i159.photobucket.com/albums/t149/...

Thanks again for all your help!!!! :D

Additional Details

2 days ago
I've never taken any classes, I intend to some day! I have a $150 kodak digital camera-- theres not a whole lot I can do with it! Also hoping to upgrade it soon :D Thanks for the feedback!

2 days ago
There's nothing I can add to my camera, and its a press the button thats it kinda deal-- I am an EXTREME amateur lol I have no idea what most of you are talking about but hopefully I get a spot in a photography class this semester and my pics will get better! thanks again, so much!

Best Answer - Chosen by Asker: 2 days ago
I've never taken any classes, I intend to some day! I have a $150 kodak digital camera-- theres not a whole lot I can do with it! Also hoping to upgrade it soon :D Thanks for the feedback!