[Konstantin]

And what was on the label?
There are also rules:

1. Author.
2. Material and equipment manufacturing (oil on canvas, paper, pastels, watercolors, lithographs, oil, pencil, etc.).
3. Size (horizontal x vertical for painting).
4. Date (1899 /early., Mid-twentieth century. Etc.).
5. Captions, labels, stamps, birochki (if any - need photos).
6. State (breaks, debris, scrapes).
7. Expert opinion (if available) - the organization + name experts.
8. High-quality photograph of the picture, the back of the painting, photo captions (if any).
9. Origin of the picture.
10. Any other information useful for the attribution of the picture.

You want the result or in mystery play?