The original drawing is very beautiful, and most skilfully done. A fine portrait. It is a shame you don’t have the original to see the artist’s name, as that might help you with the dating.
The sitter is young, possibly 20s-30s – not easy to be more exact than that.
The strange version posted in reply #3, with intensified colours and blurred detail, in my opinion, is certainly not an enhancement of the original.