I learned how to center them (I think via Panos, thank you!) when I was trying out Comet and it worked fine (either hitting "align center" for the image widget, or pasting in the right code when the image is in a text box like my highest sidebar image.
Now in bueno, the code is the same as it was in comet for the text widget, and the image widget still says its aligned to center, but both images are squeezed up to the left, crowding up to the post area.
In the image widget it doesn't matter if I specify center, right, left or none---the image is still all the way on the left.
Sorry to be posting so many questions...
The blog I need help with is crickmore.wordpress.com.