Here are some great resources for you to learn how to colorize a black and white image using Adobe Photoshop:
- How to Colorize a Black and White Photo in Photoshop
- Photoshop Tutorial: Best Way to Colorize Black & White Photos
- How to Colorize Old (Black & White) Photo – Photoshop Tutorial
- How To Add Color To Black and White Photos in Photoshop
And then here is my attempt from a Photoshop class I took years ago.