Using Ancestry images
The image I am working on (https://www.familysearch.org/indexing/batch/3a510527-5e41-41b3-9887-c40a3c74c0a4) has areas that are very difficult to read. I have found a corresponding image on Ancestry (https://www.ancestry.com/discoveryui-content/view/733065:62153) that is much better. May I use the Ancestry image for indexing this record?
I would be very cautious about using images from another site for indexing on FS. Sometimes there are very similar collections on two websites, but not every record will be the same. For example - there are multiple sets of vital records for some locations (city, county, state) with more or less the same info, but they are NOT the same record.1