1) How where the images added, don't quote me but zencart should automatically put the no image in, I think if you use a bulk upload EZ populate it skips it, you should just be able to open the products listing and select no image and it should work, have you set the noimage on in the image options?
2) have you uploaded a watermark file? and cleared your image handler cache
3) Fix your buttons, they have ugly white bits around them, there is a button construction kit in the downloads that creates buttons at the click of a button with the correct background see it
here
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