Help please with the assessment
 

This was found in domestic rubbish when clearing debris
50,7 x60, 7 cm; linen on cardboard (gelatin-she did), butter, without signatures and dat.Na back side, too, there are no markings ..
Cardboard lasting. unbending. soundly.
Made 2.4 years ago, it seems, with Sisley (I may be mistaken). Of the large album of reproductions of Impressionist ..
 Exercise in the "get color" (another interesting topic)

Dear comrades, here are questions:

1. Should I varnish? (technically, of course, already available, most times, but whether to do most before you demolish the gallery?)

2. What and how to sign (and where?)

3. How much to ask? (Though some?)

All thanks!
1 Image
2-piece (oil firm as a rock)
3-reverse side