Dear Robin,

Thank you for your request. This is a watercolor on paper by the artist Walt McDougall. It depicts an artist sitting in nature and painting a picture on an easel. The paper is signed, titled "Older Brother John", dated with "1929" and located with "Waterford Connecticut". Thus reverse writing is probably made by a second hand and not by the artist himself. There is a possibility that the artist is Walter McDougall (1858-1938), a famous cartoonist, or the watercolor is showing Walt McDougall at his work. The artwork is a bit weak in anatomical and perspectively details to be made by the hand of such a trained artist like Walter McDougall.
An estimation would be between 20 to 40 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