Douglas, Archibald Ramsay - portrait of family member

This miniature portrait is believed to be by the daughter of William Douglas, she was called Archibald Ramsay Douglas.

The painting has been applied more thickly than for William Douglas, the pose is very similar to the signed example above, and the colours are much brighter. The hairstyle and clothing are from around 1845 whereas William Douglas died in 1832.

Given the comment below, it is possible that this is a self portrait.

There is another very similar portrait in the Scottish National Portrait Gallery that is believed to depict her sister, Charlotte. The Gallery has attributed this to William Douglas, but it may in fact be by Archibald Ramsay Douglas, as the hairstyle seems to be later than 1832. 4