Combine now all the layers: Layer ? Merge Visible (shift+ctrl+e) and continue by inverting the colors: Image ? Adjustments ? Invert (ctrl+i).



We have to create now a new layer, set the necessary colors in the Gradient Tool's adjustments and paint the smoke with these colors.



Stretch out the gradient from the center to one of the corners and change the layer's Blending Mode on Multiply.