Dear Stephi,

Thank you for your request. The apprised object is a painting on glass with unknown measurements. It depicts three Siamese cats and was made by the Thai artist M. Tumpsi in the late 20th century.
An estimation would be between 30 to 60 USD.
This estimation is based on actual recent past recorded auction sales of comparables. Retail "asking prices" can be higher and vary.

With best regards,
Georg