Just layer the render by duplicating it and play with the blending mode.
For instance this is one I like to use when all else fails:
1st (Bottom) Render: Color Overlay #252525
2nd Render: Colour Dodge
3rd Render: Colour Dodge (Desaturate) and lower opacity if it's too bright.
4th Render: Screen - Lower opacity so that it isn't too bright
5th Render: Overlay/Soft Light and lower the opac till it looks right. Maybe even desaturate this layer.