This has been discussed previously here: https://forum.inaturalist.org/t/is-a-photo-of-entrails-too-offensive-for-inaturalist/5465/
Currently, best practice (if you want to make the first photo non-gory) is to post a non-gory close-up - like a foot or something - as the first photo. In general it’s not great to submit a warning graphic because a) it’s not evidence of the organism and b) it’s an image that might be used to train the computer vision model. That being said, unless it’s a consistent problem, it’s not a big deal.