Typically I can transcribe stones with even partial information with a little research.I am not discouraged by vegitation or decorations or older faded stones.
The GPS tag is more important than a quality photo. As long as there is enough information to identify the person with a little research, (I usually use family search).
Once the photo is GPS tagged it will be easier to find. Another Gps photo can always be taken later if someone wants a better quality image. A digitial camera can also be used once a record is established. The image can be uploaded directly in to the current record.
Great or not thanks for volunteering take your time learning and ask questions. If you are one of those people who prefer to learn on your own take your time and experiment its how i learned