A Ostrovsky - a sign of whether someone?

[yasuna69]

Dear ladies and gentlemen!
Please give a bit of attention to these two paintings. Familiar with whether any such signature? And what is it - two different Ostrovsky's or is it one person? The first painting - oil on canvas, 60x30 cm; the second, oil on fibreboard, 30x60 see Also asking for opinions on the level of painting, and whether the operation of any commercial interest. About the pictures, it is only known that about thirty years are in the same family.
Thanks in advance who responds, and good to all.