Original Paintings for Book Covers

I have 7 of these COOL Paintings from Hector Garrido.
They are ALL original paintings from book covers, and I got them from an online thrift store…
Mr. Garrido was in poor health, and he spoke kindly to me before he passed away.
While they are not signed, they ARE marked on the backs with information including size, cropping, publishing house, etc.
They are SPECIAL to me, as Mr. Garrido allowed me to purchase them for a very nice price.
He was the artist for G.I. Joe and OTHERS.
I have NO IDEA if they are valuable, BUT, I am PROUD to have them.
Thanks.
Warren