What is the artist

[Кирилл Сызранский]

Originally Posted by Laura; 2253011"

but the general principles I know well, and they are for all products are almost the same .

No, not the same.
Paintings and works of art in general - the goods , since they can be bought , but the goods are very unusual. Picture - any - there is only , say, copy , the second such in the whole world . There is something similar , but that's just a no.
And more than that , you have to remember that a lot of pictures for their existence has gone through dozens or even hundreds of owners and still survive.
Therefore getting a picture of the new owner acquires a right of temporary possession of this product.