Help determine the value of the work of Ilya Sorkin

[Antic]

Please help with the definition of the value of the picture "Marina" Ilya Yakovlevich Sorkin.
Where can offer it for sale (and whether there is interest in the author)?
1. Author:
Ilya Yakovlevich Sorkin (1934)
2. Materials and Techniques:
Cardboard, oil.
3. Size:
50 X 60 (no frame).
4. Established:
1985
5. Signed:
A. IP
6. Condition:
On the photo.
7. Expert opinion:
No
8. Origin of the picture:
Store "Moscow" Leningrad
Yours Andrew.