A professional will give you a second opinion if you have any questions about the materials used in artwork that you are considering purchasing.
Don't combine the original painting with a "hand painted Giclee".
Giclee prints are reproductions of original artworks. Hand-painted prints of a giclee will never be worth as much as a painting.
If you're only searching online, be sure to go over the fine print prior to making a purchase.
Do your homework on the seller/artist as thoroughly as you can.
The appearance of a person can be misleading -- especially in the art world. There have been many high-profile recent cases of fraud in the art world, in which a seemingly trustworthy dealer is actually a fraudster.
Conned art collectors for thousands or even millions of dollars
While buying artwork from a well-respected gallery or auction house can mitigate risk, even established galleries are susceptible to scammers.
Some professional organizations such as the Art Dealers Association of America insist that you comply with certain ethical standards for them to function.
They usually provide a reasonable safety margin for membership and dealers or galleries.
Be sure to do your research and be alert for warning signs.
artwork in question.