If you are like me, you might find the photo blog on the left below preferable to the one on the right:
In the left sample the photos and text are centered, in the right hand (pink) example, the photos and text are left aligned.
To center align your photos and text, either select the "Center the photos" checkbox when creating a new photo blog (e.g., by using the "New PhotoBlog" command). You'll find the option to center the photos on the wizard page titled "Auto Create Photo Blog":
You can also edit the photo blog at any time and select photos and text and apply the "Center Alignment" icon command 
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