Preliminary assessment of paintings
 

Dear experts to assess the painting (or rather the pictures ) , you can not if you get a small educational program on this issue?
At least the basics ..
Please tell me exactly how factors such as age, paintings, name and status of the artist , plot, size of the canvas , etc. affect the price of the painting ? In other words , I would like to know a brief evaluation algorithm (I understand that clear boundaries can not be here , but nevertheless , at least in general terms ) .
 Thanks in advance .