There is not yet the technology or set-up for scanning an deciphering signatures and that is most especially because the vast majority of artwork in existence was done by unlisted or unknown artists. What you have ar actually hand colored etchings or prints and these were generally sold as tourist pieces by sidewalk or 'starving' artists. Depending on the size, these can sell for a highs of $20 - $45 each.
Please take a moment to leave a rating by clicking the stars. If you require further assistance, no worries, the question thread does not close even after leaving a rating.
Just checking in to see if you viewed your answer and if you are seeking further assistance?
Please let me know.