It wasn’t Shishkin that drew the bears on Morning in a Pine Forest.
Shishkin’s and Savitsky’s Morning in a Pine Forest, 1889
The famous painting Morning in a Pine Forest was not just done by Shishkin. He spent his entire life drawing nature and he was worried that he wouldn’t draw bears the way he wanted to see them. This is why he asked another artist he knew for help.
Savitsky drew them but when Tretyakov bought this painting, he ordered his name to be removed from the canvas. He thought that everything about the painting (“the idea and the work”) indicated that it was Shishkin who drew it.
These 3 paintings by Da Vinci were supposed to be a triptych.
Leonardo da Vinci’s Mona Lisa, 1503, Virgin of the Rocks, 1483, and The Virgin and Child with Saint Anne, 1513
Some art experts believe that Mona Lisa, Virgin of the Rocks, and The Virgin and Child with Saint Anne, are one single painting, drawn in different ways and in different aspects. Also, some people think that the landscape in these 3 paintings is from the Moon, not from the Earth. This was probably because the artist was interested in geology.