Dear Janet,

Thank you for contacting Mearto with your appraisal inquiry.

The presented object appears to be a painting made in oil or acrylic paint on cardboard or board with the measurements of 16 x 20 inches. The painting depicts a landscape with a lake and trees in front of sundown or sunset. The painting is signed in the left corner with the name Beck.

Sadly no additional information for an artist with this name fitting in style and motif is given by reference books and databases. 
It was made in the second half of the 20th century. Comparable objects were recently offered and sold on the international auction market. 
This piece is in good condition and there is no serious damage visible in the images provided.
A fair market estimation would be between 70 to 150 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