There's a bunch of fallen stone rows and stuff in a field belonging to a farm called 'Thornhope' and I've made a site for them called 'Thornhope Stone Rows'. I've given the map reference for the middle point of what I call Row I.
You've added a new site with the name 'Low Thornhope Rock Art' and it is one of the stones of this Row I. It's near the middle of the row too, so they have the same map reference. If you look at the University picture you'll see the half buried stones of this row stretching toward the horizon.
The portable carved stone is part of this row rather than the stone row being part of the Rock Art. There are other carved stones nearby as well. Just one of these is recorded.