The Bookworm

I have what I believe is a colored lithograph with the Artist signature and the engravers signature.  On the back it has a number 1 in a circle.  The approximate size is 3 inches wide and 5 1/2 to six inches long.  You can see where the plate left a exact indention on the back.  It is very vividly colored.  could you tell me if you have any knowledge of and engravings or lithos with this painting and how much it is worth.  It looks to be in excellent condition.