Help evaluate the small collection
 

Dear experts, how much could cost this collection?

1. Zaretsky MS 1994. Master
The work is interesting is the fact that it is devoted to her husband, as evidenced by the inscription on the reverse side - "Dedicated to Zaretsky VI" (the inscription on the Ukrainian language) (tempera on cardboard inlay).
2. Zaretsky MS 1995. "Guardian Angel Painting" (the inscription on the Ukrainian language) (tempera on cardboard inlay).
3. Grigoriev SA 1971. "Olga" (a portrait of his granddaughter) (watercolor)
4. Grigoriev SA 1985. Untitled (watercolor)
5. Grigoriev SA 1982. "The coolness of autumn" (watercolor)
6. Grigoriev SA 1983. Untitled (watercolor)

Surely none of the experts and some can not estimate the cost?

SergArt, there Grigoriev SA (1910-1988) if your about to price http://artinvestment.ru/auctions/134...=Г&page=8
By Zaretsky MS http://artinvestment.ru/auctions/630...=З&page=2

Thank you! Grigoriev "my":)