His Wikipedia entry is here, and more information from Moscow's Tretyakov Gallery is here.
It seems this painting helped launch Nesterov's career.
Another of his many paintings with a religious theme.
An historical theme here.
Sold in 2007 at Christies Paris auction for about $14,000 (link here). Dimensions are 45,6 x 47,5 cm. (17 7/8 x 18¾ in.). The link to Christies does not mention that this is a copy of a painting by Tyrolian artist Leo Putz.
The dimensions of "Summer Dreams" are 119.5 x 110 cm -- much larger than Nesterov's copy. I can conform this, because I viewed the Putz painting several years ago when it was in Seattle. I wrote about Putz here.