Dear Thomas,

Thank you for contacting Mearto with your appraisal inquiry.

The presented object appears to be a painting made of acrylic paint on a mansonite board with the measurements of 20 x 16 inches. The painting depicts an abstract motif in the style of the art of the Aboriginals and it has the title "Carpet Snake Dreaming". It was made by the artist Rita Davey

Sadly no additional information for an artist with this name fitting in style and motif is given by reference books and databases. 
Comparable objects were recently not offered and sold on the international auction market. 

This piece is in good condition and there is no severe damage visible in the images provided.
A fair market estimation would be between 150 to 300 USD.
This estimate is based on actual recent past recorded auction sales of comparable items. Retail "asking prices" can be higher and may vary.

With kind regards, 

George