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I haven't tried photographing the Mackinaw Bridge with my A100 yet, but to me your image seems quite soft in the center and at the right. I would've tried to get the towers in sharp focus. It looks like the autofocus did not hit the right point (a common problem in low light with a slow lens). If you examine the larger version of the image, the very far left side, around the bridge span almost at the edge of the photo, seems to be in focus. The further back into space you go, the softer/blurrier the photo gets.

Applying a little 'unsharp mask' might sharpen the details in the towers.

The next time you take this photo, you might have to try manually focusing, or maybe us the 'direct manual focus' feature, to help the lens focus in the right area.

Otherwise, I like the composition & colors. I have photographed the bridge before, and I know how hard it is to get the whole thing in one shot. Which reminds me, another technique would be to take multiple photos and stitch them together (a panorama). That way you could get the full span of the bridge.

Matt,

Thanks for the comments. I don't have any "photoshop" type software other than what comes with the Alpha 100. By "soft" do you mean the blurry rocks and waves? I don't like that part but it was very dark and I had to use a long shutter speed, 13 seconds, to get the picture. Not sure how I can avoid that. Any suggestions? Thanks.