Help find the author

[Konstantin]

There are rules as to ask such questions.
Follow the listed items.

1. By.
2. Material and equipment manufacturing (oil on canvas, paper, pastels, watercolors, lithographs, oil, pencil, etc.).
3. Size (horizontal x vertical for painting).
4. Creation Time (1899 /beg., Mid-twentieth century. Etc.).
5. Captions, labels, stamps, birochki (if any - need photos).
6. Condition (breakouts, talus, scrapes).
7. Expert opinion (if available) - the organization + name experts.
8. Qualitative picture pictures back of the painting, photo captions (if any).
9. Origin of the picture.
10. Any other information useful for the attribution of the painting.