Turning photos to colour

So this is a work in progress but I'm quite happy with the results so far so decided to share it. Do you remember this tutorial to colourise historical Black & White photos?  Well I had a go at a photo of my sister and I when we were little.  I haven't done the clothes or the background, and I'd like to work on the hair a little bit more (blond hair is tricky!) but I like where it is going.  I have some family history photos that I would like to try next but one step at a time!  Here is the before and after.

Before:

After: