Vincente Garcia de Paredes OverPainting

I bought this painting at the estate sale of a 102 year old woman, this painting was her mothers! I asked questions about this - all that was known by the remaining family is this painting is in all likliehood 100 years old or more. It is an original overpainting by the artist (the artist lived mid 1800s to 1906 I believe) - I am still a little unclear of what the term "overpainting" means as I have now heard two different definitions of what that is... It is in wonderful condition, the detail is excellent. I tried to do some research on the artist and found minimal information to my surprise, or perhaps I wasn't looking in the correct places I am not sure. Any information you could provide I would appreciate. My main questions are - I would like to know more about the artist, the style of painting this is, what is an overpainting more precisely, is an overpainting more or less valuable than a regular painting, and what is the value or guestimated value of this painting. Thank you very much in advance.

Sorry about the blurriness of the signature - you should be able to make it out still - for whatever reason the flash was causing me problems when I was trying to photograph that section of the painting.

Although I don't have this up for sale, I am still considering it. Although I will admit I do love the painting.

Good