Never hesitate to take a photograph, the worst that can happen is a failed photograph but it also could prove to be very interesting too!
Keep your subject away from the background indoors and out. Indoors, this will prevent ugly background shadows (when using a flash), and outdoors (as well as in), the background generally will be blurred, leading the eye to the main subject.
Look at your own photographs as often as you can to see the patterns in them and you will also realize the types of subjects that really interest you. Always be looking for ways to improve.
Adobe Photoshop Tutorials on the Web
A collection of Adobe PhotoShop Tutorials, Tips and Tricks.