Determine the source of the sculpture. Did you buy the sculpture at an art gallery? If so, it is likely that the artwork is legitimate, especially if it comes with a certificate of authenticity. Buying an artwork from an unknown vendor online is often less reputable. If you were given the sculpture, or if you found it at a yard sale, then the original source of the artwork might appear ambiguous.
Find out more information about the artist. Try to find information on the artist in reputable art websites like artnet, a website that keeps detailed information on artists' auction results, or see if any of the artist's works reside in museum collections. The Smithsonian American Art Museum contains a searchable online database where you can find out if any Glinsky sculptures belong in museum collections. Signs that your sculpture was made by a reputable artist include: finding any record of the artist's sculptures at a fine art auction like at Sotheby's, any mention on reputable art websites or inclusion in museum collections.
Analyze the sculpture for a signature. If the sculpture has a signature, try to find images of other artworks by Glinsky to see if the signature resembles the one found on the surface of your artwork. In addition to the signature, does a number present itself next to the handwriting? If so, this number refers to an edition. This means that your artwork belongs to a series of similar artworks and that yours is not the only one. If your sculpture lacks a signature, it is likely that yours is a reproduction. If yours contains a number, especially one that appears like it was mechanically reproduced, it is highly likely that yours is also a reproduction or a later edition of an earlier work.
Analyze the materials and subject matter of your sculpture. By comparing your sculpture to other sculptures that exist by Glinsky, you will be able to discover if your work shares anything in common with the other ones. Find images of Glinsky's other artworks on the Internet or in books about the artist. For example, if Glinsky only made bronze sculptures of female nudes and your sculpture is a plastic bird, then yours is likely a fake.
Seek assistance from a professional art advisor. If you're still uncertain about your sculpture's authenticity, a professional art advisor will be able to determine the name of the artist who made your sculpture. An art advisor should have a background working in museums, galleries or fine art auction houses, giving him the experience necessary in order to tell a real from a fake. Art advisors often have access to subscription-based databases that will allow them to evaluate the authenticity and worth of artworks.