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What does &pwd=0  do? where do you place this? did you even read the question?

We have hundreds of images on our site, would it be best to rename all of the images and update their tags in one sweeping change or trickle the changes, uploading changed images every other day or so? It makes no difference to search engines. Do whatever is best for you. Search engines generally crawl a small percentage of your site each day. Even if you change your entire site at once, they will only see about 5% of the changes today, then another 5% tomorrow and so on.