Not adding additional marketing material that could jeopardize, or at very least extend, the review of product labeling makes perfect sense actually. What the FDA has to consider now is the totality of advertising, marketing, etc.. to see if there is something that doesn't gel with the proposed use. I personally think it's smart not to muddy the review waters now with new images.
Besides, there's just one or two days left before we should get a response. Is it really that urgent?