Sometimes an overall shot can suffice. Triquetrella papillata is a fairly common species of trailing moss in open areas in Canberra (e.g. suburban nature strips), has the overall look shown in this photo and that's what I think of when I see this sort of growth locally. However, Triquetrella tasmanica has also been recorded here so I leave this as Triquetrella. A wet gully could provide a greater variety of trailing species and then an overall shot might not be sufficient. If you can see the spore capsules, that can help. Habitat and what the moss was growing on can be useful. Often the former will be clear from the location details and the latter from the photo, but if not, put some brief comments in the notes. However, no matter how detailed the notes and how good the photo, there will still be cases where nothing short of a specimen would allow an identification. It may be that a look with a 10x handlens will do the trick, but then there are those where higher magnification is needed.