@artluver,
obviously the finishing nails are recent. It looks more like a portrait on a ceramic ground. These were popular means of making personal mementos of a person who ha gone or had dies.
Im not fmiliar with JWM Turner (Im sure the name is searcheable), the one we know is JMW Turner and did do some portraits but is known for his new style of seeing the world in an abstract fshion.
The gilt frame is interesting and depending where you are, itd be orth a trip to a known conservatory lb (Im familir with the WInterthur Foundation), Its part of the University of Delaware and the Winterthur museum. They have experts galore n every aspect of decortive art and antiques.
They also have one of those confocal Xrays that can see beneath a surface painting.