You need info on a picture original by Marcus stone coloured by Joseph Wilson also says kirchner co copy righted sole agents would like to know value for insurance?

To determine the insurance value of a picture originally by Marcus Stone and colored by Joseph Wilson, you should first research recent sales of similar artworks by both artists to establish a market value. Additionally, consult with a professional appraiser who specializes in fine art, particularly works from that period. The presence of the Kirchner Co. copyright and sole agents may also affect the artwork's provenance and value, so it's essential to include this information in your appraisal. Lastly, consider any unique features or historical significance that may influence the piece's worth.