Composition - none, looks like too busy pressing the shutter.
Exposure - all over the globe, seems like center-weighted matrix metering without regard of surrounding and where the model is. Oh, model is always in the center.
Flash - total disregard of the shortcoming of shoe-mounted flash, harsh light, hot spot and shadows.
At the end of the day, I am so tired with people saying, "... There is no editing to the photos, just scale down the photos. Im still trying my best to take photo without any editing...."
This is not a badge of courage. It's stupidity. Why? Post processing is equivalent of developing the negatives or slides, and the printing of the print. Even the cheapest lab will adjust exposure/color/WB when processing and printing. Then why this "boast" of no editing? Does not make sense whatsoever.
Back to the picture. Best advise, start all over.
So?
Don't use the build-in flash!
A photographer must understand the limitation of the equipment used. Work around them.
With the limitation of the S5IS, does it makes the shadows look any better? No. does it makes it worst? No. The shadow is jsut as annoying as ever, whether the camera used is a S5IS or a 1DsMk3.
Composition Yes, I now did have the feeling that I pressing the shutter too quickly. Ill take note of that.
Exposure most of the time Im using face detection focusing.
Flash I do not have a Speedlite. Im using built-in flash. Yes, I do observed obvious shadows especial when then the model is near the wall. Hope that I can invest on a Speedlite, and use bounds effects for that.
Seriously, I am not to photo processing yet. Cos if so, Im the one doing that, not the lab. I do not have experience on that.