Both pictures were image 5952. Please add one of the signatures and numbers and one of the back of the completed framing where there might be labels or writing.
This is a circa 1870 engraving by Paris-born engraver Louis Abdon Boutelie
of Beatrice D'Este (Duchess of Bari and Milan, Italy in the late 1400's)
done after a painting by Leonardo da Vinci. This engraving has a current value of
$600USD retail.Try 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 housenear you that deals in fine art and consign to them.
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There is not much known about this particular engraver other than that he
was listed as winning several awards at exhibitions in Paris for his work.
Engravers do not normally have extensive biographies written about
them in the same way that artists do.