Hi, this is a simple tutorial. Basically what it is: A grey-scale image, with one colored part.
1. Using the image above:
2. Adjust hue and saturation, click colorize then put it to 0, 0 and 0. This should make it go grey-scale.
3. Grab your Lasso tool
and zoom in and Trace.
4. When you let go, it will automatically connect it back to the start and make a selection. Go into the colorize menu again (CTRL + U). Tick colorize and set saturation to 80. next choose a Hue to 15:
There you have it, Nice effect. Use it on other images, Such as a hand with a ring