Well, for this photo, my inspiration was a combination of Sarah herself (she is a friend of mine) combined with the large set of wings that were made for the event. Sarah and I got there early so I could scope out the venue (they hired me to shoot the event), and I took the opportunity to "test out" the wings with her. I loved the way she was looking upward and thought the white vignette and soft treatment would further drive home the "angelic" mood.
For general inspiration, I find it everywhere. My many creative friends are a help, as is my general environment and the way something might be reflecting light. Lately, I have been finding a majority of my inspiration in the work of others on this site. I've found myself really wanting to improve my own skills and quality through the work of others here too. That's one of the reasons I love having re-discovered Google+ recently. This HQSP community and others like it have really given me tons of inspiration and many things to strive for in my own work. I subscribe almost exclusively to photo communities on here, so every day is a new day of vastly diverse creative work and styles from people all over the world to draw inspiration from.
As for my workflow, first, I load all of my images onto my computer and use Bridge or Photo Mechanic to find the "keepers" depending on the project. I use Bridge when I do things like product shots or portraits and need to just get rid of poorly exposed photos, etc. I use Photo Mechanic when I want to quickly go through a large set (like for events) and give different photos different ratings. Photo Mechanic just seems to have a more streamlined and faster interface for doing that very quickly.
Once that's done, I import all the photos into my Lightroom catalog. I quickly rename them according to the shoot. Typically, I do as much post-processing in Lightroom as possible due to its ease of use and non-destructive nature. I do the usual tweaks to color temperature, contrast, clarity, saturation, etc. Then I run through the adjustment brush and spot healing tools where necessary.
If any major composition, retouching, or other work needs to be done that Lightroom can't handle (like HDR processing, for instance), then I load my images into Photoshop or whatever other software I need and go from there.
Finally, once that work is done and then saved, I typically go back into Lightroom and apply any subsequent end-of-line effects (like the post-crop vignette you see in this photo) and give it some final sharpening if needed.
These days, I'm fairly set in my workflow, though I do still have some kinks to work out and some practices that I need to employ on a more regular basis. I'm constantly trying to improve myself, and I know I will never have it down to perfection. It's an unreachable goal, but a worthwhile journey nonetheless.
Thanks for the interest beyond the photo. And thanks for providing so much inspiration and for taking the time to help photographers share their work!