Several things point to its authenticity. Not only the detail of the costume, but the interiors...everything is correct for the period from the carpet to the wall panelling to the furniture. Look at the small marble topped side table. Delightful. I think this is so charming. Oh, please try and get it restored. It is somewhat amateurish but surprisingly good nonetheless. Look at the baby--it looks like an actual child instead of an adult's face on a little body. The detail of the clothing is there, the jewelry, chair leg shadows, everything. I love it. Without knowing the date on the back, I'd say it was 1815 or so, so there you go. If you can locate the birth record of the child you could add one or two years and arrive at the exact date, and I wouldn't be at all surprised if it was 1817.