Others will disagree, but since the I-751 instructions essentially say to submit as much evidence as necessary to establish that the marriage was entered in good faith, I wouldn’t worry about how much is “too much”.
For our part, we sent in about 80 photos with the initial submission, 4 to a page and captioned only with date and location. If you look at my post history you will also see that we have continued to upload additional unsolicited evidence, including more photos, every few months.