The prints were found on eBay as Queen Victoria Court Beaut(ies). The Lady at upper left is Lady Emily Foley (Emily Graham?), center is Lady Bulteel, and Miss Blanche Bury (no record found) is to the right.
The National Portrait Gallery has some of these and states they were "by Henry Bryan Hall, after William Say."
Saved at 28.35 pixels/cm, 50 cm high.