Marie Antoinette Painting

I was hoping that someone could help me out by 

by seeing if this Marie Antoinette painting is worth

any. I'm not sure if it's a original, are a re copy. 

I can't take the back off as you can see all the nails

i'm afraid that I will ruin it. Also I have another one 

of her in the same photo frame, but in a different dress. 

It would be wonderful if it was worth a lot I have a 

daughter in college and her car is almost on it's last 

wheel. 

Thank you so much for your help 

Sheila