If you have similar images you want to use the same Title, Description and keywords for you can AUTO POPULATE FROM IMAGE. The details of this is directly below the image when you are doing your editing!
I look at the photo, describe it first, making sure almost all of the words from my title and description are included. Next I try to use any possible conceptual wording. Finally I try to find as many synonyms as possible based on the keywords already picked. I have to check out this www.arcurs.com/keywording site, but right now I like www.mykeyworder.com
And yes, copying and pasting or keeping your own keyword lists for similar images helps!!!