Michelle, the information you have provided me with is far too sketchy for me to give you any kind of answer, and in any case, I am not offering a professional valuation service.
If you are based in the USA I recommend you contact a local auction house, or else prepare a photo of the painting together with measurements and details of how you came by it. Email this info to an on-line auction service such as Worthpoint, or to a large reputable auctioneer based in your nearest big city. Remember that an auctioneer will take a comission for selling your item, and unless you set a reserve price, the picture will literally sell to the highest bidder.
There is no easy answer to how much an item is worth. At the end of the day, this will be dictated by the price that someone else is prepared to pay for it.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.