If you can't remove the link, you should be able to remove the image, and you really should.
Google Checkout is (in)famous for some pretty strident potential fraud checking, and that is one of reasons that DH uses it.
Anything that appears at all anomalous to Google can cause a delay, and that can be anything from a phone number it doesn't think is correct,to an address it finds is suspicious, etc.
Now none of this means that there is actually any potential for fraud in your case, only that Google might think there could be.
As others have pointed out, anecdotal evidence here indicates that Google Checkout payments often several days to "clear" DreamHost - while we can guess as to why that is, neither Goggle or DreamHost are really saying.
You can always generate a support ticket and ask DH directly.