First off, congratulations on starting! That's one of the hardest parts.
I'm still a noob too, so I'll just say what pops into my head about your image. I'd say the first thing I see is that I wish her chin wasn't cut off. It might've been nice for this image to have been shot vertically. Also, like you mentioned about available light, I'm thinking drop the flash and use a reflector if you need to outside. Sometimes strobes are nice outside, but if you're just starting I'd say just use what's available outdoors first, get good with that (maybe I should follow my own advice! [img]/ubbthreads/images/graemlins/tongue.gif[/img]), and go from there.
I dunno if this helped at all, and hopefully others with more experience will post, but that's my 2Â˘. [img]/ubbthreads/images/graemlins/smile.gif[/img]