Today, I used a color splash technique to select various parts in the photograph to remain in color but other parts in black and white.  To start off, I duplicated the layer using Ctrl + J.   I made the background black and white and the new layer as color.  In the toolbox I clicked the black square.  Then using the brush tool, I selected areas of which I wanted to keep in color.  Carefully, I used the opacity tool and the zoom tool to have a precise level of accuracy in selecting the finer areas of the photograph.