R. Brownell McGrew’s evocative Children of the Sun, 1989 (estimate: $100,000+), Julian Onderdonk’s romantic Field of Bluebonnets with Trees (estimate: $60,000+) and a Mono Lake Paiute Polychrome Coiled Basket, c. 1930 (estimate: $50,000+) are some of the respective top lots in Heritage Auctions’ May 5 Western Art Signature Auction, Texas Art Signature Auction and Signature [...]