I make art myself so I have a pretty good eye for these things and Im not 100% either way so I came here.Welcome to Tnet.
Very nice, but are you absolutely sure this is the original pencil drawing? If so, it would have been done with charcoal pencils. However, Eliezer Carul's works were widely reproduced as wood-block prints and it can be difficult to tell the difference without close examination. Many of them are being sold as "originals" but they're prints from the original engraving, not original drawings.
This one (same Mayan figure as yours) was on eBay a while ago with a "buy it now" of $40 (and $30-$40 would be a typical price). Apologies for the image quality but the actual listing is no longer available and this is from a reposting:
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Is there any numbering on the back or elsewhere which indicates it to be from a print run?