Unfortunately, I am not able to offer this service. There are numerous online sites, however, which allow you to browse their collection of artist's signatures. The majority of them charge an access fee. Identifyartistssignatures.com has a limited range of signatures that you can browse for free, as does WikiCommons. Another alternative is to look at a book of artist's signatures and monograms at a local library. There are quite a number of these available, and they can sometimes be picked up at a reasonable price on Amazon, eBay or abebooks.co.uk. If you often have paintings on your hands, you might find these books a good investment.