I got some mixed photos. I will assess what I see from these photos.
1) Yaacov (Gipstein) Agam lives in New York, Israel, and France. Yaacov Agam is known for religious and environmental themed sculpture, kinetic and optical art. This is a limited edition Artist's Proof (marked AP) serigraph, number 25 of 27 printed. This piece has a value of $800 retail.
2) Victor Vasarely (1906-1997) lived in France and Hungary and was known for op art painting and geometric images. This is a limited edition
print of a painting titled Gestalt, originally a collage/series on paper done in 1969, this being number 210 of 150 printed. The value of this pieces is
$1100 to $1500.00.
Some sites that I recommend for selling are Varagesale.com, Ioffer.com, OfferUp.com, Ebay and letgo.com
or list ads on these sites; artbrokerage.com, askart.com, artnet.com, artvalue.com, or artprice.com.
You can also go to invaluable.com or liveauctioneers.com and search their directory for an auction house near you and consign to them.
To finish, I will need you to click the five stars at the top of your screen and hit the submit button, thanks!