The great thing is, you're taking a picture of someplace in your own backyard so you can go back time and again to get the right shots.
I used to subscribe to "Digital Camera" magazine out of the UK. It had many great tips but the best thing was this little pullout booklet which came with one issue that went through composition techniques. Might have been 20 pages in total, but I go through it every so often just to reinforce. Not sure if it's online anywhere.
I'm sure there are other sources like this available which will help us develop the hobby.
EDIT: This isn't the one I have but it's along similar lines and comes from the same magazine.
http://www.scribd.com/doc/10330580/D...ng-Composition
Pages 22/23 on Focal Point apply to your shots above.