Harp

Rops, from Belgium, sells on 17 December 2017 a "18th century" King Salomon, estimated at 4,000 to 5,000 Euro.

No idea who painted it, it is too generic and not showing enough character to place it with or close to a specific painter, but I can tell you two things: it is a King David, not a King Salomon, and the beautiful harp is not a new invention but copied with minor modifications (making it less explicit, which may also explain the changed position of the harp).

It can be found originally on a painting of the same subject by Domenichino, some 200 years earlier. Our painter may have learned about it from a print (example from the British Museum).

The estimate seems somewhat optimistic, but Rops has surprisingly high results sometimes.