Another topic where this was discussed: https://forum.inaturalist.org/t/add-comments-or-wiki-like-functionality-on-taxa-pages-to-discuss-identification-and-other-relevant-issues/91
For spiders, a lot of diagnostic information is published about the epigyne, palps, and eye arrangement, but relatively little about other features, so it can be really helpful to find a high-quality observation which has a photo of one of those plus a photo from almost any other angle. Top, underside, closeups of the legs, spinnerets, anything! Even a photo of a web can teach us something new about identifying a particular species. High-quality photos are good, of course, but a few low-quality photos from different directions are sometimes much more useful for ID than a single high-quality photo by itself.
For focusing on orbweavers, try carrying a sheet of white paper to hold behind the web while you photograph the spider, so that your camera doesn’t autofocus on the background. In a pinch, just holding your hand behind the web can work. Another trick is to carry a magnifying glass, and take photographs through that. This can make it possible to take in-focus photos of small insects with a cheap camera which doesn’t have any way to manually control the focus.