Good Pics, but you can use your A200 even better, it's a better camera than it looks from it's price, seems like you have used 18-70mm kit lens for all those pics, indoor shots of flames are good but fireworks you should have used slower shutter speed to let it capture the dramatic effect of-course you can try this next time. For outdoor shots 18-70mm kit lens is not an ideal lens when you want shoot at telescopic end and try to capture the detail of object far off.
It works good for little bit of micro work like you did with flower. And also good for portrait photography, but don't give good result when you fill the entire frame at it's telescopic end. This lens is dramatically sharpest at f8 than any other f number. Try more shots at f8 for better sharp results when ever possible.
Happy Photographing
Cheers
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