Here is some critiques
Afternoon sky and Eastern passage would look better if they were level. (Picasa can do those easy things and it is free!)
The Rose - The shadow in the back ground is a little distracting, A more even back ground and it would make the rose stand out more.
And the light house is good, but it would be more interesting if you got lower and had more of the foreground, the line in the bottom middle of your photo leading up to the light house is a strong point where it can draw the viewers eye in.
I think you are doing good, just focus on keeping the pictures straighter
Hope that has helped!