Merge the two layers together so you are left with only one. Then using the dodge and burn tools I simply used a round soft brush to paint values higher and lower to make things more dynamic.
Hvernig Merge eg Layers saman? :/
Add a colorized hue layer and select a color you would like to work with this will adjust the gray tones to new monochromatic tones. You may also choose to create multiple hue layers and mask them in order to vary the colors. Once finished merge all these layers to the bottom one.
Hvar er þetta Hue Layer?