Help determine the price

[lerm]

Please help identify cost-Albert Goguadze, thin cardboard, oil, 28h36, on the back of his signature
  no name but seems to view at City Hall, is when he is already in Germany


And another: 1976-78g Petrov-smooth Jr. "Flower" 17h32sm, board, mixed media on the back of the year, title, author, date of birth, his signature
  Just wanted to know is not hypothetical, and the cost of which can realistically sell

 
Thanks in advance