Thanks for all the great replys! That kind of criticism is what I need.
I will work on my focus more closely and see what I can do to make that better. What do you recommend to get that spot on? I am using 40d with the 28-135mm IS lens.
What do you recommend for use as a fill flash? Can you use the on camera one or would I need a speedlight on a remote flash cord?
thanks again!
Start with the second question first. Your on-camera flash has limited application as a fill flash, mainly because more often than not, you're (a) too close, and (b) need the light to come from a different direction. An off-camera speedlight is definitely the way to go. Before you go running out and spending a lot of money on a new flash however, don't forget that reflectors and diffusers, especially for outdoor work, make a LOT of difference. These can be very cheap; I get a lot of use out of the big piecs of heavy paper/cardstock that they sell for a dollar or two at art supply stores. White, or light yello are the most useful, and they can be trimmed and bent to fit almost any situation. The shiny foil "space blankets" are also very useful.
I have a couple of commercial diffusers, but these too can be home-brewed. Thin tissue paper works well, and for lighting, I get a lot of use out of translucent white plastic. Photography, especially portrait work is all about the lighting (although a pretty model doesn't hurt) but the lighting doesn't have to be expensive.
Your focusing question is a little more tricky. It depends on why you're missing the focus. My first guess is that you're accepting whatever the camera tells you, and if it chooses the wrong point on which to auto-focus, you're hooped. Always watch and see where it's focusing. Equally important is Depth of Field, (what "depth" of the image is in focus). This of course depends on your apeture, and is where the Depth of Field preview button becomes critical.
The middle image was shot at f 5.6 which based on the lens you were using and the focal length was either wide open, or almost wide open. No lens works it's best wide open - always try and stop down a couple of stops at a minimum unless there is a good reason not to. The further you stop down, the more area you have in focus of course. I would recommend that you do a search of "Hyperfocal distance" and "Depth of field calculators" there are a number of good articles which will explain this, and hopefully eliminate this problem.
Hope that helps.
~John