Dear Themistocles,

Thank you for the additional images and your patience. The presenetd object is a drawing on paper with the measuremnts of 25 x 17 inches. It depicts a abtract interpretation of a figurine. The drawing is signed in the right corner with the name "Lassitri" or "Lassitril". Sadly no artist with such an name is mentioned in auction record lists or similar databases. This drawing was made in the last third of the 20th century.
An estimation would be between 60 to 120 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