Samuel Lopez colorization

I am going to turn this black and white picture of Albert Einstein, and turn it into a colorized picture using photoshop.

The first day, I changed the background, his hair, and his mustache. I did this by making a separate layer for each one of those features, and colring them with with the brush tool. Once I did that, I went on bleding options by right clicking on the layers and clicked on blending options, and chose the overlay option.

The next day I worked on his hands and sweater. Doing the same thing i did the day before(creating new layers for each feature, coloring the feature, and lastly going to blending options and choanging the blending mode to overlay).

The last day I worked on his face and details.