“Bush Babies” (2017) by Njideka Akunyili Crosby.   THE AUCTION PRICE FOR A PAINTING by Njideka Akunyili Crosby climbed a bit higher last week. “Bush Babies” by the Nigerian-born, Los Angeles-based artist sold for nearly $3.4 million including fees at Sotheby’s New York, a new artist record. Her previous high was just north of $3...