Four works, help assess
 

Welcome , dear friends . Please help evaluate the proposal. The first picture presumably Leo F. Dyakonitsyn 100x80, Vladimir Potapov second 60x80 , third and fourth signed Ivanova TV 1990, could not find information about this author, tell me who knows . And the interest rate for all four papers . Thanks in advance.

Tatiana Ivanova ( 06/21/1946 , b. )

Born in Moscow in 1946, in 1970, graduated from the Moscow Textile Institute . Since 1966, the beginning of participation in exhibitions. In 1973 he joined the Union of Artists. His works are in museums: Tula, Yaroslavl , Vologda art gallery, other museums and private collections in Russia and abroad.

Cyril Syzran, Thank you for the info