Nice painting .
I would not rule out the possibility of it being authentic & being worth around $700-$1k .
Copies/reproductions (& fakes) of his work do exist .
I'd suggest inspecting the painting with a 10x to 30x lens ; look for actual brushstrokes in all areas of the paint .
If you do find these everywhere in your painting , you can prob. rule out glicee (sorta high-tech means of reproduction) .
The sig on yours is more 'embellished' than others that I've seen in person , but that does not mean alot - just one more question to investigate/research .
You may also find other clues on the back of the canvas .
DuFrancs' paintings are very popular in France & Venezuela , where they sell fairly quickly .
Again , nice little painting , authentic or not !