The Raspberry Pi camera is often more powerful than a webcam because of the great PiCamera API. However, the camera is a bit farsighted, and needs ~60cm minimum distance to the subject to be able to focus. If that much space is not available, an inexpensive cell phone macro lens can be used, often sold as part of a set (fish-eye, macro, telephoto). These lenses have a magnetic ring that attaches to a ring of metal, which in turn attaches to the camera with adhesive tape. The lenses work OK, but the English instructions may be awkward.