Changing day into night

For a created a photograph where a girl is looking reading a book where light is illuminating from it for a bookmark contest.
I took the picture during the day but I wanted it to look like I it was night time so I them had the challenge of turning day into night in photoshop and create light coming from the book.
To do it I lowered the exposure in an adjustment layer and then masked out the girl. Next I made another adjustment layer and lowered the exposure a bit less and then masked out the background. For the blue light I just used the paintbrush tool and then set the blend layer to color.
Then for the light coming out of the book I created a gradient using the pen tool and then did another smaller one to make the light closer to the book more powerful. I them used Gaussian blur to make the edges fuzzy.