AlexSidore,
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 of the expert.
8. Qualitative picture pictures back of the picture, photo signature (if any).
9. The Origin of the picture.
10. Any other information, useful for the attribution of the painting.
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Meaning guessing? Need more information ..
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